If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that’s for the future of us all.
Not exactly anonymous…
Lemmy will most likely go the way of 4chan, they’ll ban connections from all major VPN services and start banning users via IP.
I’m sure that it’s a little more complicated than that with a federated network. Since you can host your own lemmy instance you could hide your information behind that.