I don't know about Chess.com, but lichess has moderators and auto bans in cases of obvious cheating. Always playing stockfish's #1 move isn't humanely viable because the fish sees lines in blitz or rapid games that can take humans hours to find. Unusually rapid improvements get checked by mods.
You're not being sneaky; You're just no fun, and if you want to actually better yourself in Chess this is a good way to ruin your future credibility ~
