The more restrictive your thoughts may be as an adult. The less 'free wheeling', and therefore, more locked into tight, controlled paths.
Further to that, even if the above is not significantly true, there is still the entire "does the work I want to do, the research, threaten PRC dogma in any way?"
And worse...
"Will the work I do, threaten PRC dogma in the future."
On top of all of that, a reduction of international collaboration with others in the field, and so on.
Of course, I could be entirely wrong. But I do think that "restrictive environment" leads to "less creative output", at least in visible output.
TikTok's For You algorithm is pretty clearly based on YouTube and Netflix's published recommendation platforms, but I'm not sure why you're framing this so narrowly. The entire product is a Vine clone and they regularly steal content for marketing purposes (c.f. https://twitter.com/xTempex/status/1182185566999318529).
We don't really see this level of abuse from American or European firms who have ethnically Chinese executives. It's not really a matter of race; it's a corporate culture that is more common in highly-competitive markets with weak IP protections. Trying to frame it as racist isn't really productive, especially since the parent comment wasn't specifically talking about Han Chinese, but about the nation.
Those that decry 'racist', when one complains about China are indeed the true racists, for they think culture and race = the same thing.
This is true of virtually any recommendation system implemented anywhere and YouTube and Netflix most certainly did not invent any of the basic concepts involved. In fact the core algorithms for recommendations are very classic and the newest techniques can be credited to Microsoft research and Geoff Hinton.