Legally, he can't do it, so no worries... unless he got permission from other member which is unlikely. Unless he went to the one in Hollywood. Then, they'd be scrambling for face time.
AA is the only safe place certain people have to unload every ugly thing and admit it all or purge it all. You can do this with a shrink, but that doesn't provide a fellowship of support.
It was really hard for me to deal with my Mom's initial foray in to AA because at first she was very dogmatic. She had to renegotiate her relationships, and it was hard for all of us. People get into entrenched relational patterns, so if someone changes, it is hard for everyone else to re-adjust. (Even if the changes are beneficial to the initiator.) For me, it was uncomfortable at first, partly becuase I am so conditioned against group think. My Dad is the same way I am, but more generous in spirit. I had to resist the urge to cite the Orange Papers. My Dad has always been a cold turkey guy, so he doesn't understand the need for a group. He quit smoking cold turkey, he quit vodka cold turkey (after realizing he had lost the ability to distininguish vodka from water), and his mother, a raging mean, gun toting alcoholic quit cold turkey as well. So, he doesn't really understand the support group rationale. (But he was also the one who told my Mother he wasn't sending me back after I split the program. He never totally brought what they sold.)
Her center is a mexican version of AA so, they are a bit more relaxed.
After two years, I'd say the changes she made were beneficial to her. Once she got over the initial immersion, it was also beneficial to us. She doesn't feel like it is her job to make every fucking person happy when they don't want to be. She stopped overbooking herself and killing herself for people who don't apreciate it, she let go of some resentments, and finally, was able to apologize without defensiveness when the case is warranted. She was raised in an environment where her feelings did not matter and she finally learned what her feelings reallly were and you can be true to yourself without being a shmuck. She started to be able to validate other people's feelings, instead of saying "get over it." The irony is that people tend to get over things more quickly once they are validated.) It also really helped her get perspective over things we can't control. These are all good things, so who am I to invalidate her experience because of mine? She chose it.