This is exactly why Valve's work is important with SteamOS. The more SteamOS devices people use, the more of a viable market they are, and so, a direct incentiv

This is exactly why Valve's work is important with SteamOS. The more SteamOS devices people use, the more of a viable market they are, and so, a direct incentive is born, against locking games out of Linux. Personally, I don't think it will get worse than it is now. Some games are locked to some platforms, be that Windows, PS5 or Switch, and many great games can be enjoyed in Linux.