I had never been a core figure in the local group, so it was easy enough for me to melt away unnoticed but one of my friends was an organizer and regular lecturer. When she finally decided to leave over exhaustion from increasingly abrasive and hostile tone of the group to any dissent, she was harassed for months. The group was seemingly offended that she rejected their brilliance and become an apostate.
I think they eventually got subsumed by the Atheism+ movement, which then imploded.