Is kbin a community, or a platform for communities to run on? I'm subbed to maybe 20 magazines now, and I can't even tell you which one comes from which server.
I think of magazines as communities, and servers as enablers of the platform they run on. Sure there are purpose-built servers around a topic, but as a data point of 1, I haven't joined kbin to be a part of kbin community, I joined because it seemed to be the most reliable provider for me to reach communities across fediverse.