kernel anti-cheats do not want to develop for Linux due to the lack of a fully secure environment in the OS.

I don’t think it will be possible to limit non-casual cheating (i.e. those who are willing to spend money) using the dynamic matchmacking approach.

The only way to beat cheating is to have “old style” community servers with regulars for cheaters to be kickbanned by someone with admin rights and/or server votes for kickbans. Not saying this will happen any time soon in the mainstream, but I don’t see an automated approach working short of something like required real world IDs.