I think most of those are Instagram shoving it in your face. Yeah I'm a "Threads user", but only because of the inline feed in Instagram. I'm annoyed when there is a notification blip but it turns out to be Threads spam.
Threads' launch was intentionally rushed in order to capitalize on the user discontent at the time. Without a large alternative, enthusiasm to migrate to another social network would have waned. Note that Bluesky was still invite-only when Threads launched.
How many users on X (Twitter) or Bluesky are bots? It's reasonable to assume the percentages are the same, given the lack of public information for the major text-based broadcast social networks. X is estimated to have 250M daily active users. Mark Zuckerberg recently stated that Threads' DAUs were 100M. Threads achieving a bit under half the size in such a short time is impressive, especially since Threads still lacks many features that X has had for years.
> It's reasonable to assume the percentages are the same
It's reasonable to assume they're worse. Bluesky doesn't have Facebook's network or surveillance apparatus. Neither does Twitter, except it's a higher-value target than Bluesky and Threads combined.
Daily Active Users (DAUs) and Monthly Active User counts represent the amount of users that perform activity on the application daily and monthly, respectively.