How much could a player improve just by watching agadmator videos?

Nothing vulgar at all.  As for going off-topic ... you are the one that went off topic by claiming to be the UK U10 girls champion. It is pretty easy to look up the current holder of that title  It seemed unlikely that you would be Clemence,  as she has an account in which she reveals her name, so Yashashvini was the most likely other candidate.  If you are not either of those then who are you? 

I think you need to look at the 2021 U10 girls champion.

Thank you. And congratulations on your success.

Yep thats me

I got agadmator in my teeth, from an old dentist, but now I have ceramic :-)

unlike what many people think, raw exposure to many master games IS beneficial to your chess. you are getting exposed to many tabiyas in game situations this way 

some youtubers are better than others, it then becomes a question if the games shown are particularly  illustrative  and if the depth of succinct explanations is sufficient. But baseline, being exposed to the games has a benefit.

from learning standpoint never, instead use chessable courses or hire a coach who can save hundreds of your hours and million calories of energy you would have to surf to understand chess.

Very little, but not zero. Depends on the approach.

I don't think anything will work for you without on the board play or a buddy system.

First of all people, Agadmator's videos are not passive.  He likes to pick games where there a "pause the video" moment where you have to find the winning move.  It's about one puzzle / video, on average.

But DON'T take Agadmator's advice to only take a few seconds.  That's wasting the opportunity to become a better chess player.  Take the total opposite approach: don't unpause the video UNTIL you are sure you found the winning move.  Take "score" of the ratio of failed guesses to correct guesses and try to push yourself towards a higher and higher fraction. If you at first only got 1/5 guesses correct, 20%, shoot for 30%, then 50, 60, 70, and 80%.

No you learn some from the rest of the video.  Even Medow knows this, since he comes into the room as soon as he realizes Agadmator is starting to teach.  But it is hit or miss.  Agadmator explains some things.  Simple phrases like "connecting the rooks" are great lessons.  But, his format isn't to teach openings.  He just plays them out and says this is basic theory so long as it is popular in the master's database.  He has to since it would waste time to the better players who watch his video.  I guess you could replay the videos in slow motion, 1/4 speed, to learn openings you didn't know.   

Also, Agadmator makes chess exciting.  Yes, you can learn from watching random videos about specific things, but they are just that. Timeless.  Boring.  Agadmator's stuff has historical importance and value since he is talking about recent and actual games about chess celebs.  It makes chess exciting, and this will help you be incentivized to become better.

My biggest complaint about Agadmator is that he always minimizes any chess celeb blunders.  Usually he will say something like "but of course with the time pressure there's no way to see this," etc.  In the Tata videos, he says this constantly, but the truth is that the increment is 30 seconds.  MC plays berserking bullet, which is also 30 seconds.  Per game.  So, 30 seconds increment means Agadmator is just lying, IMO.   I have to get a computer eval to check if what he is saying is really true.  For example, in a recent game where Fabi blundered (why Agadmator covered the game), there were actually 4 blunders (check it yourself), one even from Anish, not just one from Fabi.

Second of all, to the people saying you need to play to get better instead of watching videos (which is basically what most answers here say), no, playing isn't the answer, either.  See "The fourth and last piece of advice" section of https://www.quora.com/How-can-I-improve-chess-calculation-skills/answer/Jason-Taylor-16 to know why, but, in short, you could play game after game after game, but unless you are learning from your mistakes, and knowing what they are, and trying to remember how you got there and why next time you won't, you might not be improving at all. 

with all due respect to mr astrophysicist playing is the absolute answer and you yourself pointed it out at the end of your paragraph, so you need to play tons of chess plus and you have to do all the necessary side stuff that is required to be able to become decent at chess, again playing is the key but its not the only thing you wanna be doing, you can have 10,000games next to your name and you could still be an absolute beginner or some intermediate so its the process that matters and it goes like that,
1.Playing 2-3-4-5-6........... infinte steps

No.

He's a weak player and gives superficial analysis.

It's a fine way to expose yourself to some famous games in a casual setting, and I don't dislike agadmator personally or anything, but it's not a good way to improve.

And in general videos aren't good because it's passive. At the very least you should be pausing at interesting moments and doing some analysis yourself.

Levi's a candidate GM the same way I'm a candidate FM... lol

I would love it if you did that since it highlights a beef I have.  You see the curious aspect of the candidate master and women candidate master titles is that they imply the non-candidate version of these titles are subjective, and not simply a function of your games. Like you need to write an essay, give a speech, are loved by x% of chess GMs, etc.  It's the way I think chess secretly operates (don't ask how or why please), so that's why I love anyone bold enough to leak out such truth. Hat's off to anyone with balls so big.

i personally find agadgator quite instructive as he has a good eye for the "what if" continuations i immediately think and desire to see a comp reply on while going over a game and i really enjoy his little questions he poses within positions. They are nothing compared to standard puzzles but something about being forced to find a powerful idea in 5-10 seconds i find useful.

I think he’s a bit overrated, but I’ve enjoyed the way he goes through good games quickly. He seems to have a pleasing voice—good radio voice—and it is entertaining to watch his critter walk past.

Your view is certainly worth thinking about and of far more value than most of the comments in this thread.

I prefer Danny King and kingscrusher. I’m a little biased in favor of kingscrusher because when I started watching him there was little else of value, I like the commitment he made to systematically go through a great many classic games, and I have played him both on his website (correspondence) and in a pub when I took a trip to London. He does use engines too quickly, in my view, but his positional explanations strike me as pretty good.

I also prefer books to videos so do not watch as many as most of the you younger folks here.

This isn't that related to the topic but just wondering, why do those youtubers publish chess content for free? Other authors have written publishd books about them and receive money in royalty. What motivates them to provide content for free? Is it truly because they want to spread chess knowledge, or because they receive some money in ads and it pays for their expenses/another way for them to make money? Do make content right up to their actual level (which may reveal the depth of their current thoughts) or to a notch below so they keep their current progress/what they're working on separate from their youtube content? And it may give them more peace with playing? I could imagine someone making videos below their level to make money but not wanting to reveal stuff at their current level, it makes economical sense to me. 

Apologies if this has been asked before, but I can't find anywhere that I can see an answer to this, so seeing responses from here where I asked the question myself would be pretty helpful. Thanks! 

YouTubers can make money from ads if they have enough viewers.

Google pays me for my blog.

Total income after 14 years of blogging is $175. I was paid the first $100. Need $25 more to get the second. Click on an ad, I earn a penny. I get about 1000 views per week.

The YouTubers who earn money get 100s of thousands of views.

Thanks! That answers all my questions! c: