Bluesky released support for RSS feeds earlier this year [1] making it easier to implement support for Top Articles, as it existed for Twitter. They also removed their invite-only system [2] and have started growing again.

[1] https://openrss.org/blog/bluesky-has-launched-rss-feeds

[2] https://bsky.social/about/blog/02-06-2024-join-bluesky