China is magnificent at long term thinking.
I presume you aren’t part of the crowd on HN/Reddit who are (still) upset that Russia used social media to “influence” the 2016 election? Imagine if say, a certain Asian country had detailed information about the habits and desires of millions of Americans, do you think they could do something similar in a future election?
And yes, maybe everyone is lying to you, and the NSA is doing it already. Maybe they already have radios in your microwave building a database of your breakfasts. We just don't know.
But at the end of the day I know a lot of people at Google and 100% of them would push back on governments requests as hard as humanly possible, and there would absolutely be whistleblowers if this was happening. I'm just not going to equate the two.
I do think they are obeying the letter of the legal mandates and have a social graph of all non citizens who have ever been to the US, or interacted with anyone from the US. But not US citizens, no.