I would say there’s no value in assigning such a tight definition on self-hosting–in saying that you must use your own hardware and have it on premise.

I would define selfhost as setting up software/hardware to work for you, when turn-key solutions exist because of one reason or another.

Netflix exists. But we selfhost Jellyfin. Doesn’t matter if its not on our hardware or not. What matters is that we’re not using Netflix.