Bluesky seems to operate pretty well with 3M+ users and 140M posts [0], but I'm fascinated to learn how the decentralized systems would scale if even just the Bluesky reaches within an order of magnitude of Twitter's scale (~500M tweets per day). Or from a behavioral perspective, what kind of ecosystem will evolve when the API has (afaik) no gatekeeping. The fact that anyone can see any other user's blocklist (both who they're blocking AND who's blocking them) probably has had at least a slight effect on interactions.