To put it another way ...
Imagine I am, for want of a better word, a nut job who nevertheless looks normal to the untrained eye.
And I join AA and I get sober.
Because I am a nut job I tend to talk a lot in meetings; and I impress a newcomer to the extent that (s)he thinks I can help.
(S)he asks me to sponsor them.
Because I am a nut job, of course I say yes.
I then dispense bollocks to that person for as long as (s)he will listen.
What do you expect to happen if you report me to AA, be it via Cultwatch, The General Service Office in York, or getting my name chiselled onto the Naughty List on the back of founder member Bill Wilson's gravestone?
They can't throw me out; I have "a desire to stop drinking" which is the only requirement for membership.
They can't stop me sponsoring anyone; remember, the newcomer sought me out, not vice versa.
They could ask me to change; but, as a nut job, I probably won't.
You certainly can't identify me, even if you wanted to, because you don't know my surname.
All you can do is what we all do, all the time; you trust the 99% of sane members of AA to take the newcomer aside and say, "be careful of listening too much to Sean; he looks normal but is, in fact, a nut job."