In Trump's first term he attempted to dismantle NATO, something China has always openly opposed an often targets in its psyops as "western imperialism". In his second term he tariffed almost every nation on earth which resulted in China filling gaps. This isn't even up for debate, though, look for yourself:

LINK: TikTok favored Republicans during election

And then:

TikTok, which currently operates out of Beijing, now, in the past, and forever, voluntarily shut itself down and then turned itself back on in order to endorse Trump. Biden had already announced he had no plans to enforce any such ban.

You're free to debate whether China's actions were beneficial for them, but it's pretty fucking clear China took the actions.