Threads has begun testing federation over ActivityPub. And they have blocked two important servers I administrate. The first server is the Mostr Bridge. The Mostr Bridge connects ActivityPub and Nostr together, so people can communicate across protocols. The second server is Spinster.xyz, which is arguably the largest independent feminist community online.
Funny, there was a thread a few days back where people were raging about Meta being able to “harvest” the data they were posting in public on the Fediverse, and one of the ways people were insisting that Meta could be stopped was with “authorized fetch.” That’s exactly what Meta is apparently using in this case to block those servers, and which has been trivially worked around.
Public data is public, any attempt to make it conditionally public is just going down the DRM dead-end.