does the gap between rapid and blitz decrease for most people as you go up?

Yes, the game quality is obviously better, but the player pool is also stronger for whatever reason, at least in my experience. Back in the day @Ultimate-trashtalker said so too.
I'd accept your 1+9 challenges but if it was unrated which i guess defeats the purpose

You cant compare rapid and blitz ratings, they are 2 cometely different things

Your dumb

Magnus Carlsen 3233 blitz, 2896 rapid
https://www.chess.com/member/magnuscarlsen

"ll I know is I suck so hard at lower time formats"

Cheating detection at lower time is not working. Why? Because I suppose it's considered to be a lucky game. I watched a stream from GingerGM about how to go from 900 to 1000 elo rating, he lost 2 games and he is GM.
And what I notice when cheaters blunders early in the game, they start playing perfect chess.. Yesterday in a blitz game, a player blunder knight at 4 move , he got 92% precision game

I know that a lot of players when they piece up start playing very bad chess (just trade pieces and go to the end game, like me in this game), in this game, I blunder knights later on. But when I analyzed the game, It was a draw (just +1.12), even with my knight up (2 moves before I blunder a knight).. How is this even possible with 1400 elo Blitz player?

42, moves game, 1 blunder, 4=normal move, rest was top engine move.., 0 mistakes.

How he is not a cheater?. Even to lower down his precision he could take my bishop at the end of game he did not, he picked up a lesser move which was not a mistake.
Cheat detection is not working on lower time formats.

After blunders, perfect chess This is not detected.

As players become more experienced and proficient in chess, they develop a stronger ability to recognize patterns and motifs quickly. This allows them to make faster and more accurate decisions in blitz games, leading to a smaller rating gap between rapid and blitz.