Some games do or did specifically block proton. Roblox was one example. But it is some, not many, a usually widely critized exception. Linux and the steam deck

Some games do or did specifically block proton. Roblox was one example. But it is some, not many, a usually widely critized exception. Linux and the steam deck specifically are not regularly specifaclly blocked - why would they do that? It just would limit their customer base and annoy actual customers. Tu put actual effort into earning less money would be crazy. The games that do not work either still use incompatible cheat detection, like you said, so we are talking only some multiplayer games. And the incompatible rest is just a technical accident that Proton will probably fix with time.