Thank goodness for the stardate!

Technically you only need to register in one instance and can interact across lemmy and kbin instances, but you can register the same username in various instances in case of defederation. Lemm.ee federates with all and all instances federate with it for example, beehaw.org doesn't allow signups and has defederated lemmy.world and sh.itjust.works.

Lemminists alone works too