Consider it this way:
Threads is an ActivityPub installation with most posts running in local-only mode: federated only within the Threads 'instance' itself.
And you can opt-in to performing full-federation.
And inexplicably, every 30 days they warn you that you are fully federated, rather than running in local-only (unfederated) mode.
Yep. They really revolutionized the space alright. All those Threads users, able to effortlessly migrate off of Threads and into the fedi--
Wait, I'm just hearing that never actually happened. Huh.