The threat in the US is not from the government, it is from the private sector. The issue is not what Google wants to do using access to your personal data (sell ads), it is what Google's customers (not users) want to do with access to your personal data.

Government is supposed to keep the private sector honest, so to speak. With weak government, and a private sector with single entities that have more data about citizens than government, the risk is arguably greater.

There are reasonable limits placed on government in the US, but those limits do not apply to the private sector.

Comparisons of China to the US make some sense when based on size, but if ignoring size, comparing the US to China on the issue of digital privacy and propaganda seems strange assuming one is trying to illustrate that the US is some sort of high benchmark. It is arguable there are other countries where citizens are enjoying greater digital privacy and more freedom from propaganda than in the US. It would seem to make more sense to compare the US to those countries.