Also, X does provide community based fact checking too, which works best when there are representatives from all sides participating.
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
Downvoting is a user action. There's no real gain to blame the entire community for their individual action against a single comment. Feel free to inquire if you really need to, but half the downvotes I see are pretty explicitly breaking the guidelines.