The vast majority of P92 users will have 0 clue what federation/activitypub is, let alone actually log into Lemmy, Mastodon, Kbin, etc. For them, they will forever think of themselves as @username, not @[email protected].

There's an argument to be made that that's exactly why everyone else should defederate preemptively.

Think less "Bitcoin" and more "Freenet." IMO the point shouldn't be to try to monetize stuff, it should be to decouple content from the instance it was posted on (i.e., to mirror popular content across instances to distribute the load) while still maintaining control and attribution for the user that posted it.