Been playing old episode and wondered. Who are some people who seemingly cut ties with CBB or vice versa, and why?

Just wondering on past frequent guests that don't appear anymore. Some that had scandals are pretty straight forward like Middleditch, Sans, maybe Gelman. But what about James Adomian. He seemingly abruptly disappeared. Andy Daly seems to still be on good terms as was in the holiday show, just left for more money for his own pods? Who else?