Some people don't handle being beaten very well, so they will accuse people of cheating in order to win.
That said, discussions of cheating in the general forums are not allowed. Read through the following, it should give you an idea of what people think:
https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know
If you would like to discuss further you can join the following group:
https://www.chess.com/groups/home/cheating-forum
a lot of ppl here acuse me of cheating, when they loose. I try to ask them how is that even possible, but usually they have already left the game or abuse my mother, etc.....
Can some1 please enlighten me: How is it even possible to cheat at this game?!?!?!?!