There’s already an entire Star Trek instance, startrek.website. Niche instances may end up being a way some communities get around the issue of big servers defederating from each other over their different administration policies. With that topic having its own instance, Trek fans on Beehaw and Lemmy.world can unite in nerdy fandom across the divide. I’m not quite sure how the defederation works through a third party instance though, if posts/comments from Lemmy.world users to startrek.website will still show up when viewed through beehaw’s display of the communities there or if they will be filtered out of the feed locally.