this post was submitted on 30 Jul 2023
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each instance has its own user base, charlie@instance and charlie@otherinstance are not guaranteed to be the same person any more than @charlie at twitville and @charlie at ig.
That's actually likely to cause some issues down the line with people impersonating other users, but for now It's fine
I mean, it'd be similar in validity as charlie@outlook.com pretending to be charlie@gmail.com. Yeah, it'll fool some people, but easily checked if you keep your head about you.
The difference is that ActivityPub clients currently only display the username part and hide the host for some reason. This can lead to confusion, I don't get why the full address isn't displayed by default.
On liftoff for android I see always the full username.
Email does that too. It's even worse, you can make "support@microsoft.com" show up but it's really badguy@somewhereelse.com. Granted, many emails hosts are getting better at flagging these, but one can still click the name to confirm on Kbin or Lemmy.