How is Bethesda "pulling" their games? Nvidia is pulling the games, under pressure from Bethesda. That's not quite the same thing.
The reason I make the distinction is this: if Nvidia were confident that they were in the clear, legally, they wouldn't be removing these games. I'd argue that they are in the clear, and I certainly hope so, because this is functionally equivalent to Bethesda telling you and I where we can or can't install our purchased games.
But, in the world we live in, it's quite easy to argue that any purchase only applies to very narrow, specific ownership rights, or none at all. Which is bullshit, of course, but that doesn't mean it's not true, in practice.