if every game has one cheater in it, no one will play your game

Exactly this. Any game that even hopes to have a remotely decent competitive community needs to have a solid way of not just targeting cheaters after the fact, but in keeping them out of games. Because even if it's just something like 1 in 5 games being decided by cheats, if people become aware of it, any value people placed on a competitive ladder are going to evaporate overnight.

And for what it's worth, I fully support the ability to do things like local matches or private servers where anti cheat is partially or entirely disabled. I love modding and letting people play their own game their own way. But when it starts impacting other people's experiences, there need to be rules in place and enforced.

Oh, and for those people saying that no anti cheat should exist, go hop in an online match of splatoon 1 on Wii u, and honestly tell me if that's what you want out of a competitive game. Because that's what not targeting cheaters gets you