I'm late to the party, but if you haven't seen looks like #bluesky / #at has been getting some rapid growth, to the tune of at least 1 mil over a few days.

https://www.theverge.com/2024/8/31/24233174/bluesky-has-gained-a-million-new-users-in-the-last-three-days

Also, quick PSA: don't forget the Mostr bridge will let you follow Bluesky accounts.