I see, but there is Steam DRM there. So, I guess as the other commenter was alluding to, if Steam goes belly up so does your collection, regardless of the dev studio's intention (Or atleast, locked behind a DRM bypass).

I understood this in terms of Live Service games, but did not consider Steam's ability to shut down their own platform and kill my locally installed single player games with it (Again, I'm seeing its possible and seems easy to bypass usually, but the principle of the matter)