This is sort of what Scuttlebutt did. You receive and distribute posts by anyone you follow, creating a decentralized network, not just a federated one. I enjoyed checking it out briefly a few years ago, but there really wasn’t that much to see, and it would randomly cause your computer to run hot and eat up gigs of storage. I also worry about inadvertently storing copies of illegal images on this kind of network.

That’s the beauty of this design, you only seed what you share. If something is not worth seeding, you don’t share it. You are only responsible for the seed you selected to reseed. That also acts as a verifier in case someone edits the comment later on. You put an id based on the timestamp and every user uses a signature that allows others to verify original source. The client could theoretically auto trust certain signatures if it is proven to be from a trusted user.