Cheating discussion is not allowed on the main forums. And you can't do much about it anyway.
How do I avoid players from Arab countries and the Philippines?
Blaming whole countries because of some people from them cheated isn’t the right thing. Cheaters can be from any country
Also there is no way to disable matchmaking from specific countries
Discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums. If you would like to discuss join the following club
https://www.chess.com/club/cheating-forum
Because most of them are cheaters, as always