I couldn’t sign into my account on a different instance, so maybe it’s not?
Thanks for answering (please stop answering)
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Yes, but not like that.
You have a membership at the instance you sign up for, and from there you can interact with the rest of the Lemmyverse. I don’t have an account on Lemmy.world, but I do have one at sh.itjust.works, and from there I’m able to browse, read, updoot/downdoot, and comment on posts in other instances.
