Might be missing your point, but a studio for rent does deny paying customers if it wants. Conference facilities might deny particular events. TV networks deny ads that are otherwise legal.
But I don't think it's needed in the argument. As you say, the interesting distinction is around platform versus publisher and any legal protections you gain from posing as the former.
There's only so far a metaphor can be pushed, unfortunately (or fortunately?), and I completely agree, the real point is the distinction and whether it applies.
But I don't think it's needed in the argument. As you say, the interesting distinction is around platform versus publisher and any legal protections you gain from posing as the former.