@SteffoSpieler It's another social media network created by the same people who backed Twitter and Nostr. Instead of going with ActivityPub however, they decided to make their own VC-backed protocol called AT.
The protocol itself is not too bad, but its controlled by private companies and BlueSky has decided to basically avoid moderation and offload everything to AI labelling.
In short: it's decentralised Twitter with venture capitalists trying to control their own fediverse :/