Yep, yep, private firms in the west are harvesting our data and using it in not-so-great ways. Same with our security agencies. But... imperfect though they may be, we do have many tools with which to hold them accountable and affect change, even if the odds might be stacked against us most of the time.
Not to mention, we've seen how bad western companies tend to be at securing data (e.g. Equifax) - its not going to be any better in China or elsewhere.