Since usernames are only unique to the instance it’s created on, what’s to stop someone from creating a copycat username in order to impersonate another user?
What do you mean your username?
spoiler
This is obviously a joke. I have no intention to use this username for anything else.
!genzedong@lemmygrad.ml (but take note that lemmy.world has defederated from them)
No different than email. That’s why domains should be displayed in clients for users.
This “problem” isn’t new or unique to the Fediverse, or even to the Internet. It’s much much older. What’s to prevent someone from hijacking your name?
Most societies converged to a simple solution: surnames. The Fediverse is not different. “YourHuckleberry” is your username and “@lemmy.world” your usersurname. It is impossible to hijack your name+surname.
Welcome to freedom!