How is that trivially answered with Mastodon? And what does "the rest of the world disappearing" actually mean in your example?
Everything I'm seeing about hosting costs in the current day and age is that the full AtProto stack (PDS, Relay, AppView) is roughly in par with hosting an ActivityPub instance of equivalent size (if not a little cheaper).
And with AtProto, folks get to pick and choose what slice of the stack they wanna host, and opt-in to more of it gradually as they see fit. With ActivityPub, you are either opting in to hosting an entire instance, or fully reliant on someone else.
I'm open to the idea I'm misunderstanding some aspect of ActivityPub, given I've not really explored the hosting side of all that deeply.
Everything I'm seeing about hosting costs in the current day and age is that the full AtProto stack (PDS, Relay, AppView) is roughly in par with hosting an ActivityPub instance of equivalent size (if not a little cheaper).
And with AtProto, folks get to pick and choose what slice of the stack they wanna host, and opt-in to more of it gradually as they see fit. With ActivityPub, you are either opting in to hosting an entire instance, or fully reliant on someone else.
I'm open to the idea I'm misunderstanding some aspect of ActivityPub, given I've not really explored the hosting side of all that deeply.