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Is impersonation a possible problem in the fediverse?
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That's why instance is part of the username. It's no different than email addresses.
Setting a display name hides the instance bit. You have to check the URL or profile to see which instance they're on, which people definitely won't do every time. Especially if an impersonator just joins inside a thread mid-conversation, it won't be obvious at all that it's suddenly a different person writing.
Just like emails, when people write something like
”Amazon Gift Cards” <yolo@yolo.com>
in theFrom
field.