Guess it depends what you mean by "cancelled". There are accusations of misconduct which caused specials and projects to be temporarily or permanently halted (Louis CK/the TV show Louie, Roseanne Barr, TJ Miller, Chris Hardwick), there are attempts to censor or delete (Dave Chapelle, Joe Rogan), and outright disappearance from the comedy scene (Bill Cosby). Each accusation has its merits and detractors, but there is no doubt that everyone above has had their comedy output affected by (usually) unrelated aspects of their personal life being called to question.