I think your Android TV metaphor is a bit off base. By default you only have access to Google Playstore apps (the equivalent to games on Steam). And it takes a not insignificant amount of research to learn how to sideload apps. And many Android TV devices flat lock you out of doing so to begin with.
Android TV is more of a “large enough walled garden that you can miss the walls and might not noticed you’ve even been locked in” situation imho.
I mean, the whole Epic v Google lawsuit was about the walls in this garden.