I think i have 2
How many brilliant moves do you have?

According to chess.com insights, I've had 358 brilliant moves, which accounts for between 0.1% and 0.2% of all total moves. A very small amount indeed! So roughly one in 500 moves is Brilliant. Funny, as I recall one game where I think I had either two or three in a row.
I will try to find it!
I also believe the 'brilliancy' flag has become more common since the methodology was amended about 1-2 years ago. I think it used to incorporate something to do with playing a great move that the engine initially did not see. I think it's now geared towards a more 'human' idea of Brilliant which is typically sacrifices or critical moves that set up a winning attack... as I now routinely see a brilliant flag when I play some gambits where the tricky move is part of the opening theory!!
One common example that comes to mind is 1.e4 e5 2.nf3 nf6 3.nxe5 nc6 4.nxc6 dxc6 5. e5 ne4 6.d3 bc5!!
Or it might be in an alternative move order:
1.e4 e5 2.nf3 nf6 3.nxe5 nc6 4.nxc6 dxc6 5.d3 bc5 6.e5 ne4!!
Both of those lines are transpositions to the same Knight sacrifice motif in the Stafford Gambit, well known and has surely been played thousands of times online and occasionally throws up the double exclam "!!".
In fact, quite a few trappy sacrifices seem to trigger them:
https://www.chess.com/analysis/game/live/54610099299?tab=review
Another Knight sac idea in the Stafford - different to the one above, that I just noticed also gave "!!".

.02% - .04% of my moves are brilliant, depending on time control
about 200 in total
How much does the Similar player feature give?

.02% - .04% of my moves are brilliant, depending on time control
about 200 in total
How much does the Similar player feature give?
either .1 or .2 depending on time control. my highest % is in daily chess which is to be expected i guess

I just checked my insights, 95 for me across all formats. Is there a way to see what the moves were? Like a search option for the moves?
No @midnightluxary.

I just checked my insights, 95 for me across all formats. Is there a way to see what the moves were? Like a search option for the moves?
No @midnightluxary.
you can found the games by first beginning to look in the last 7 days. If you had brilliant moves than you can find them by slowly reducing or augmenting the time screen.
Just like that stupid game, find the price, and you guess a price and the answer is higher or lower, you slowly reduce the screen.
once you have the date of a few, you can find in the completed games which it was
that's the only way top find. it goes quite fast.
In the future think to save in a library each game with BR move.

Two:
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1. At my 'best game'
https://www.chess.com/forum/view/game-showcase/my-best-game-on-chess-com-so-far#comment-64107453
24.Qg5 !!
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2. Right now, in a blitz game
I consider 27.Qg4 to be a brilliancy.
27.Qg4 is only excellent, but it turns out 25...Re6 is actually Brilliant according to chess.com! Good job!!

I think above 1900, a tactical player will have them quite regularly, at least I do. like just now. ( move 30 )

Just played one, this is the second or third time if i recall correctly
https://www.chess.com/analysis/game/live/65040737319?tab=review
Sheeeeesh