Great read, warnings like this should be added to the conversation as long as federation with Meta is brought up. Especially for non-technical users or new users who haven't seen embrace, extend, extinguish before we will need some way to let them know what is on the other end of federating with large companies.
Sadly that's exactly who Meta wants, is people who don't care about the underlying system and they I'm sure will spend much more convincing those users that federation with Meta is a good thing.
Interesting, I had no idea they had one till now.