This is just the first step for group chats and communities on Bluesky. We're going to be evolving this with your feedback. Let us know what you think!
As a chat participant, you decide who can invite you to Group Chats: everyone, only people you follow, or no one.
This setting defaults to "only people you follow" or whichever you've already set for DMs.
Invitations appear in your chat request inbox where you can approve or ignore them.