Literally politics. Marxists weasel their way into positions of power by bribing, blackmailing and sucking-up. Cancel culture is literally all about sucking-up to people above you and the punishment for failing to do so. These lefties are extremely intolerant of any opposing worldview, when capitalists/libertarians that they displaced largely didn't care what was put out as long as it was profitable. Combine that with a near-monopoly that lead the Marxists to get over-confident, and eventually they start putting out propaganda despite profitability eventually in spite of it.
Once they've taken out the industry and all the jobs it created, they say it wouldn't have had so many people lose their jobs if the government employed everyone, then they move on to another industry to destroy. That's why they hate indie comics so much. The industry was supposed to tank with no survivors.