The US has a court system that reviews National Security Letters, and can accept challenges to them, and while that court is secret, it's still bound by rules that are established by elected congressional officials. ...and perhaps most importantly, they are still somewhat rare.
Chinese companies on the other hand are required to cooperate on all requests, even international subsidiaries of any Chinese companies. No "letters" or court orders - you either do it or the CEO goes to jail, no trial, no judicial review.
It might seem like the results are similar, but having judicial and congressional oversight makes a world of difference in tempering how/when it can be used and, more importantly, rolling it back when it's no longer necessary.
https://en.wikipedia.org/wiki/National_security_letter#Doe_v...
It's a night and day comparison.