Kind of, but not exactly. I'm asking for a solution where kbin.social and lemmy.world and startrek.website all post to the exact same community, but in a way that doesn't require me to be subject to the whims of the mods of any specific instance.
If a mod on !startrek (currently the largest Star Trek community instance) were to go on a power trip and ban anybody who mentioned Star Trek: Discovery, I wouldn't want to be part of that community, anymore. Most people wouldn't care, though, and just wouldn't post about Star Trek: Discovery. So, fine, I go subscribe to another instance where they allow Star Trek: Discovery, but if !startrek has 20 million subscribers, and the next biggest instance only has 40 thousand, the experience of using that next biggest instance is going to suck in comparison. That's the problem I'm trying to find a solution to: a situation whereby a specific instance doesn't control the content for everybody, but instead they only control the content for their specific instance.