Well, there is a prohibition of threads in the main forum about cheating. It mostly exists to curtail baseless accusations.
However, you are encouraged to join the Cheating Forum club and post your ideas there. You can't post accusations there about specific opponents either but you can discuss ideas such as allowing members to request games against players who have been members for a minimum number of games.
https://www.chess.com/forum/view/site-feedback/fix-the-cheating-this-site-is-pathetic-joke
Why locked? How do I get my money back for my paid membership? I don't pay to deal with cheaters and this BS nonsense. Why don't settings exist where I can strictly pay against tenured accounts, paying members, where cheating is less likely than some free account they just opened last week? Why have a site feedback section just to lock the thread 1 minute after opening it