I imagine that the dynamic here is reminiscent of the western media's self-censorship. Western journalists learn to conform to certain standards and topics because they understand what kinds of articles are more likely to be published and advance their careers. This is largely influenced by the preferences of media company owners and advertisers, creating a selection pressure for content producers to conform to these expectations.
In contrast, in China, censors strive to identify potentially politically sensitive content and tend to err on the side of more aggressive censorship. This is due to the understanding that being overly cautious in such matters will not result in negative consequences, encouraging a more conservative approach to content regulation.