I mean if you don’t want others to get to it.

Or if say you want to participate on 2 seperate servers that don’t federate eachother.

But in general a small hobby lemmy instance, can join all the communities on the large general purpose one. Hence, you are talking from a server I’m not familiar with, and we’re talking in a discussion on the largest most general purpose instance.

Only reason I can think of is if you are really worried of people confusing you for say a Deranged_Kermit@lemmy.world, or something.