Been a minute since I've seen that. And that's actually one huge advantage of the Fediverse. There can't be a [Removed by Lemmy] because 'Lemmy' is a federation of servers with their own rules and regulations and aren't even all based in the USA. And if any server starts these shenanigans, you can just move to another.
Although I do wish that profiles and comment history could be preserved from one server to another. That's basically the last piece of the puzzle that would give the user a completely a completely free experience.
Yeah it's nice to be able to import your list of subscriptions at least. But for comment history, I guess it depends what you're getting out of a place like this. On Reddit, I liked going back sometimes and seeing what I was posting a couple of years ago. Especially if it's personal shit, or even old review posts for movies or whatever. I like having a stable online presence or identity with a history to refer to.
Just allow people to bring their own IDs to servers. Self sovereign IDs, or SSI for short.
Blockchain has a usecase here, and it would be for disabling your ID in case of privkey leak, or for having people or entities strengthen or verify your pubkey or tie a hash of your birth certificate to it.
Blockchains are great for providing reliable immutable and verifiable timestamps of data. The reason they are safe is because a lot of people have tied actual value to it, and thus most don't want to invalidate the blockchain and destroy their value.