[yoda222]

Several people in other comments explain that you could have a password protected session, or a session in which users must be waiting in a lobby until someone approves their admission. This seems pretty normal, and I think here Zoom may not be able to do much more.

But I have the feeling that this is difficult in pratice to use for a AA meeting. I'm actually lucky enough to not to have the need to participate to such a meeting, but from what I understand from it, the anonymous part is important, as well as the possibility for newcomers to participate. I doubt for these reasons that AA meeting groups have a list of participant clearly identified, to whom they can send a password protected link, or that they could use such a list to check that people are someone part of the group.

Unfortunately, I'm not sure that this kind of problem can be fixed (technologicaly. On the non-technology side, we could hope for a world without asshole, but that's only a dream)