Why is Stalin so heavily associated with the "cult of personality"?

Stalin didn't like idealist portrayals of himself; yet I see the term CoP associated with him. (In Wikipedia and HoI4 (Soviet Union focus tree) for example.)

I don't see that term around Mao Zedong, Fidel Castro, and ironically around the DPRK; but they also are demonized as evil dictators that force the people to worship them.