Are usernames single-use across all instances, or is it unique just to the one you signed up with?
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Usernames are unique only to the instance you registered with. Someone can be CrimsonFlash on a different instance than the one you are on, just like they could be CrimsonFlash@gmail.com or CrimsonFlash@yahoo.com.
There’s no need for you to register at all the instances, just pick one and follow the communities you’d like to.