@J12t Another possibility: Meta has good business reasons for doing a decentralized network (which I think is clearly the case), and ActivityPub is one of the best-known decentralized protocols , so it's a good PR/marketing approach to say they're starting there.
Either they make it work with proprietary extensions, or they say "we tried it but it didn't work out, and our approach is better because ..."
@jdp23 I'm not seeing the "good business reasons for doing a decentralized network" for Meta?