Having participated in the notes system, it largely became another ideological battleground and was too slow to add the, by and large, accurate notes in the end. The majority of views and reactions had already happened
One of the appealing aspects of Bluesky / ATProto is that there can be multiple fact checkers that users can subscribe to, which can have differing governance models, policies, and operations. Within the app, you can decide which ones (more than one even) at an individual level. This means we can have competition, but also echo chambers. It will be interesting to see how it works out