There is no HR department or board of quality assurance for effective altruism: it's like Spiderman fandom: the only qualification for becoming a fan of Spiderman is
saying that you are a fan of Spiderman. The other Spiderman fans have no way to kick you out of the fandom. EA is more like Spiderman fandom than it is like priesthood in the Catholic Church.
At least in the Bay Area, I heard that the people who regularly organize in-person events will refuse entry to certain men who have a history of preying on women, but really there is no way to prevent those men or anyone else from persisting in publicly proclaiming that they are effective altruists.