The platform crossed the milestone last night, and it happened about a month and a half after the 25 million mark. Bluesky still has a long way to go to pass Threads, though; Meta’s platform has more than 100 million daily active users.
[Media: https://bsky.app/profile/bsky.app/post/3lgu4lg6j2k2v]
On Mastodon I have no trouble interacting with other users there. I have 2 accounts running on different instances - one global and one local. No trouble at all finding an account on either of them.