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If you worked with crypto, I think you would understand that ALL crypto is federated, not P2P. You need full nodes to communicate with in order to validate transactions. This is fundamentally federation, anyone can spin up their own full node and participate however they want.
Same is happening here with ActivityPub instead of block chain transactions.
I know what you mean, but all nodes are equal, they are fully participating (stay aside validators). I mean every every node handles every transaction and can be faster than another (it doesn't matter due to validation scheme, but technically speaking all nodes handling every user action)
You clearly don't know what I mean. While the each node is storing the same block chain... not every node is handling the same amount of traffic. Nodes can choose which nodes to peer with. I, for example, have a full node that only accepts traffic from a handful of trusted nodes and from my self-hosted btcpay instance.
Users can choose what nodes they wish to validate their wallets to. Many companies and exchanges only validate against their own full nodes. This is not equal. There is no sense of "equal" here. Aside from eventually the "correct" block chain is eventually agreed upon by the majority of the network.
This is exactly the same in this case... lemmy instances that want to peer, will peer. The activitypub standard will broadcast updates just like a block solve notification to the blockchain network. It's up to each node/peer what they do with it.
Ok, you are right about peering, I tried to get more peers to be faster, but it isn't necessary. I didn't find anything about ActivityPub broadcasting, but if it's true... so, yeah, having rpc p2p connection doesn't make the whole system less federated. But still, usually crypto clients has lists of nodes (or api balancers) for faster handling.