Not sure what you mean here with your sarcasm. Proton means that developers can just write games for Windows and expect to make that version compatible with Linux with minimal changes as opposed to making a native Linux version.
As a developer myself, I know that it doesn’t make sense for a developer in most cases to write a Linux version and support it when the Linux user base is tiny by comparison. It happened with OS/2 and it can happen again. Not to mention Linux game developer tooling pales in comparison to Windows with DirectX.