China has media laws that would make much of what appears on any sort of Western media platform illegal, so they're obviously going to get a very different experience in China. From anything that might violate social ethics, to clickbait titles - all illegal in China. They've even cracked down on overly effeminate men - 'girly guns' [1] and a million other things I'm not listing here. Basically Western style social media simply is impossible there.

In any case, entirely Western oriented platforms also push brainrot to Western viewers, so I don't think there's any conspiracy so much as just cultural differences.

[1] - https://en.wikipedia.org/wiki/Niang_pao