Can you explain more? How would this do anything to prevent sockpuppets?
Imagine something like a verification check (like Twitter’s old blue check) that is exclusively associated with your national ID. You can have only one of those. If you want to create sockpuppets, you’d have to convince someone else to (a) give them access to their ID and (b) be willing to lose their ability to prove their own identity elsewhere.
It’s not absolutely safe against bots and sockpuppets, but it surely makes it more expensive than even a $10/account membership.
Pixelfed has support for most of the Fediverse.
PIxelfed is still just supporting ActivityPub. I’m talking about multi-protocol communication. A smart client should be able to let you communicate with Lemmy communities, subreddits, Facebook groups and all types of different platforms from a single unified interface. There are plenty of people that think this is something undesirable (like everyone that wants instances to block Threads), but I’d argue that building these integrations with closed platforms would eventually destroy them because they would lose the monopoly on network effects.
You can’t bring an actor ID to a new domain name, can you?
No, but you could have a web server that responds to multiple domains. Ideally, the server listening and responding to the AP requests should be able to work with multiple “virtual servers”, instead of having to have only one instance == one domain that we today. AFAIK, only Takahe does this for microblogging.