Which is not possible because you can't guarantee one account per person, anyone can make as many alts as they want, specifically on other servers that can then inundate a post on a target one. That's why it's so problematic.

In retrospect, federation itself is a terrible idea the way it's been implemented. I don't think the developers took the fact that humans are inherently evil into account.

In fact, they undermine an upvotes-only system too, since one person with 5,000 bot accounts can make anything look popular.

This also is true. 🤔 Allowing people to vote on other people's comments in general is so deeply problematic.