https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
Using an engine in a rated game will get your account closed, even if the other player knows you’re doing it! ... If you want to do something like this, the game MUST be unrated, and your friend MUST be aware that assistance is being used, or your account will get closed!
Basically the other person needs to know that you're using an engine
idk because u don't lose ELO, but i don't want to get banned