Steam is different, though; many games have no DRM and even more just have Steam's DRM that's already been cracked globally and is super quick to patch. They also maintain access to paid games even after they're delisted.

AFAIK, the only problems with maintaining access to Stream games are software-as-a-service games when servers go down (MMOs and multiplayer servers, basically) and music with expired licenses (fuck the RIAA and copyright law for that one; not much Steam can do about that.) I have many delisted games in my library and I can download them any time I want.

Sure, Steam could go down, at some point. Maybe. But it's not a big concern.