big_louse, Is there anything in #ActivityPub that prevents mass surveillance? seems like (most) meta data is shared openly between federated nodes, wouldn't be hard to info mine or index the fediverse, especially if you're a giant corporation or modern intelligence agency.
If you're seriously interested in #privacy look into something #P2P and ideally built on top of a distributed #DarkNet like #Tor or #i2p like #Briar or maybe #Session also #SSB i. e #SecureScuttlebutt , #freenet is cool also