China has state-coordinated schemes to both suppress its own internal population (which may not concern you if you aren't Chinese and never go to China) and to manipulate people globally (which everyone should be concerned about).
While it's true that all countries collect data for the purposes of propaganda, China does so at a scale and with a level of precision and control that pretty much no other country can reach.
You should be trying to limit the amount of data that ANY group gets about you, but some groups will do more nefarious things with it than others. Google for example just wants to advertise to you. Which is bad, I'm not trying to downplay that, just contextualize it. China wants to control every aspect of everything you do. China's capacity to control people outside its own borders is limited, but growing. The more data China gets, the more leverage it has to manipulate, coerce, and control.