Stopping cheaters is very easy... play with your friends.

I'm not talking about MOBA/MMO games here... these kind of games are not my kind.
30 and more years ago I played Diablo 1+2, CS 1.6, Quake or UT with my friends and we simply started a "LAN-Server". We never used BattleNet or Public servers and none of us used cheats or something like that, because that simply ruins the challenge and you don't want to f**k up with your friends.
And why the hell should I want to play multiplayer games with people I don't know... me not.

I think that multiplayer game developers should go back to the roots and release a LAN-Server along with their games. This way they don't need to setup that on themselves in the cloud/onprem for thousands of people, pay al lot of money to keep it running, fight cheaters, monitor the load... and so on. A LAN-Server capable for 8-16 players should be enough! This would also help game preservation.

What Valve (or third-party) would need to do here is simply an easy way to make the LAN-Server reachable for my "Steam-Friends" (a pick list would be great) through the internet, that's all!
If you are experienced enough you can do that on yourself but you NEED the f**king LAN-Server.
It's really sad that game developers do not release a server binary with their games anymore.