They have over 1.8 million users currently, or do you mean PDSes specifically? Federation is in open beta on a test network, you can try it out today if you'd like.
bsky-social-scbch-eolha
bsky-social-fs26y-d6gnv
bsky-social-2lx5u-ntrdv
bsky-social-hboq7-dyuue
bsky-social-b2v3f-3a23q bsky-social-lkzsp-7x7ja
bsky-social-p4vwr-nrthu
bsky-social-bdu6c-6tbv4
bsky-social-fkpgk-oestwHow many of them active?
These kind of movements makes me think they're not serious about scaling up. Wouldn't surprise me if then end up as an also-ran
The exceptions are those rare products that despite a low cost marketing sell themselves so well that their organic growth is fast and in a few months everybody use them.
Maybe Bluesky don't have the money to advertise or is not compelling enough. As one data point: I know about Mastodon but I think that I learned about Bluesky only today. I went to their site and there is nothing to explain how it works except that it's some social thing. I learned more by reading the comments here. Apparently it's being marketed at a very low cost.