It's actually quite simple. Bluesky consists of many components, layers, labelers, moderation tools, relays, lexicons, and storage—where your identity and data are stored—called PDS. WSocial is a PDS in Europe; the other components run on Bluesky.
Ah, so the many people with a proper *bsky* address can see my stuff, and I see theirs, and we can mutually follow and all… does this mean I have technically a Bluesky account that just happens to be hosted on a fringe-y server?
Another strange thing is that you have to verify your identity with your ID to use WSocial, while you can use the same network without verification on any other platform.
And unfortunately, they lack transparency and tell people about the European network, even though they're implementing the Bluesky infrastructure. Take a look at Eurosky—not everything has been implemented there yet either, but you can clearly see where things stand:
eurosky.tech/build/