A key difference is that PRISM was a scandal, a massive stain on the reputation of the NSA, and behavior that the majority of Americans condemned and will roundly condemn again if exposed. Can the same be said about China on such state surveillance behavior?
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On an aside, but related to the broader conversation, the YouTube channel AsianBoss regularly visits China and conducts very revealing interviews with Chinese people on similar topics to those discussed in this thread: https://youtu.be/sTzgE1nvxZs
In China if you're discovered to have the wrong religion they'll put you in a concentration camp where they may or may not murder you and sell your parts. Don't worry about your family, they'll assign a rapist to your wife who will sleep in bed with her and reeducate your family.
There's literally a WWII scale Holocaust going on in China right now. You have a lot of nerve asking "what's the difference?"
