Comment by danijelb

Resistance from Mastodon enthusiasts doesn't matter. Governments and companies can still decide to run their own ActivityPub infrastructure, running on Mastodon or something else. Threads and other services will federate with them, users will be able to follow accounts from those government and company instances.

Small Mastodon communities can choose to not federate, but they would be missing out on a lot, assuming ActivityPub takes off.