The Lemmy platform is just a tool to manage and delivery content. And I think it's important to differentiate the software from those who manages the software. I can see there's is a tacit connection and influence there. But unless they start baking inherently bias features into the software and skewing it, I don't think it's a big problem.

Also, because it's an inherently federated platform, if people don't like the opinions of those who run a specific instance, they can (with the inclination and determination) spin up their own instance and manage that the way they see fit. And that has happened quite a few times over the last couple of years.

So no, I don't think it requires a fork really. Not unless the people managing the main branch lose interest and the software starts to wither on the vine, or they start corrupting it somehow. But that's just my opinion.