It's not a silly question! I'd describe it more as an alternative to Bluesky, not really a competitor; all of the infrastructure and algorithms we’ve designed are fully interoperable with the rest of Bluesky. Rudy Fraser's 🔭🖤🚀 Social media’s next evolution: decentralized, open-source, and scalable is a good overview, including a description of the approach to decentralization

And no, it's not only for Black people. That said, as they get farther down the line they'll have some areas that are Black-only (using an approach that's based on fedi's local-only posts).