Because if the files are hosted, they can be streamed. And they’re going to be hosted. They can’t control that.
Who can't control that? AA? Of course they can. If their bandwidth spins out of control, they can just pull the torrent. The Law? They can compel whoever is hosting the frontend to take it down, or persue legal action against AA.
Because it’s an inevitable reality?
Not really, no.
The reasons you listed specified why AA cannot or should not host the files.
That's not true.