Communist regimes collapse by trying to do half ass capitalism to compete, which is hard because when people get a taste they like it and want more of it.

Most of the time the "communism" is only for like the period of the first dynasty, then it rapidly morphs to a much less ideological and more like state capitalism or national socialism form.

CCP is communist in name only, they have all the trappings of national socialism (even camps for problematic minorities!).