That will do nothing other than make it a little inconvenient to someone that wants to cheat in daily.
Idea how to stop cheaters
In daily games, there's a button "downoload PGN/FEN" I think it's better to remove this button, because cheaters can just downoload PGN/FEN and past it to eingine.
they can just set up the position in their UCI/chess program and they'll cheat anyway.
My question concerns issues such as not being able go move pieces and getting game abandoned, is this a bug or a cheater?

chess.com has a mind-boggling amount of statistical data re: normal human performance in the game of chess, and quite a bit of statistical information on what top-level-play looks like. They can tell, with confidence, when a player is exceeding statistical norms by a suspicious amount.
taking away the ability to download fen/pgn's literally isn't going to do anything to deter cheats. Besides, they (chess.com) could easily be monitoring this, if they felt it was needed (ie "does player X download a pgn every time immediately prior to playing what looks like a computer move?"...)... That would be a not-so-subtle way to catch a cheat.
But leaving all of this aside, this really isn't the right forum for this discussion.

My question concerns issues such as not being able go move pieces and getting game abandoned, is this a bug or a cheater?
It's a symptom of being disconnected, not due to anything about your opponent.
https://support.chess.com/article/213-how-do-i-fix-my-disconnect-lag-issues
I don't understand what's the point of the download and copy PGN in the middle of a daily game. It should be removed.

I've always wondered why anyone would need to download the FEN/PGN of an in-progress game to be honest.

Two reasons to make the FEN/PGN available - both legal
a - Copy the FEN or PGN to a database.
b - Copy the FEN or PGN to a better analysis board.

Somehow, Ches.com knows who the cheaters are... they added me several times the points I lost playing against them...
In daily games, there's a button "downoload PGN/FEN" I think it's better to remove this button, because cheaters can just downoload PGN/FEN and past it to eingine.
