If you don’t retain some kind of actual ownership, they will not be allowed to use terms like “buy” or “purchase” on the store page button. I hope there aren’t huge holes in this that allow bad actors to get around it, but I certainly loathe the fact that there’s no real way to buy a movie or TV show digitally. Not really.
EDIT: On re-reading it, there may be huge holes in it. Like if they just “clearly tell you” how little you’re getting when you buy it, they can still say “buy” and “purchase”.
They don’t make it clear which games have steam DRM and which games have nothing at all, they only list it if it’s a third party solution like denuvo.