If they don’t, please also follow https://fed.brid.gy/ so your BlueSky account is federated to Mastodon. If you move to Threads, please turn on Fediverse integration.
It’s so frustrating, between Mastodon, Bluesky and Threads almost every person I used to follow on Twitter exists somewhere else. But only about half of them are accessible in any one platform.
If you need the feature set of Bluesky and can’t use Mastodon, please also follow https://fed.brid.gy/ if you can. This will allow Mastodon users to follow you from the Fediverse.