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I just made my first Lemmy PR
(github.com)
This is a most excellent place for technology news and articles.
Theoretically yeah. Depends on how quickly the attacker is working or if they have enough information to know where the account lives. If they're doing their due diligence, they could 100% confirm that. But if they aren't, they might just go to a random instance, try logging in, and see if it works.
By no means is it bad to offer a response, but it always risks giving an attacker more information than they need/the victim would want to have discovered about them.