Linux

It would be very hard to imagine that Android would look as it does now 15 years ago when it was almost fully open source and AOSP had all necessities included sans device-specific firmware blobs.

I haven’t seen any indication that Valve sells their Steam Machine as an open platform, more that they dishonestly advertise it as „runs all your Steam games” (but they don’t include Windows license to actually do that).

Locking down SteamOS won’t appear as a heel flip when it comes because it’ll happen gradually. Introduce little friction here and there, slowly herding people towards preferred but optional measures, until they’re no longer optional.