Federation directly addresses this. If there’s a locked community, or a fake community on some instance, make another elsewhere. There will be some growing pains, but eventually people should migrate to the community that best suits their interests and attitudes. It’s messy and more work than just taking the big corporate sponsored option, but that’s the nature of organic communities.
There was another thread recently asking, “Do I need to subscribe to [community] on all these different instances?” Sure, that’s a great way to find the ‘best’ one for you. Or just sub the biggest, or the one on the biggest instance, and hope for the best.