I'm not going to lie, if I was a Chinese spy, I would absolutely troll my American counterpart by flooding my internet suggestions with Chinese porn for zero reason, just for typing "fuck China".I think they're more likely to reserve bans for something like mentions or imitations of the Standoff of '89.
"Fuck China" would probably just be interpreted in its other definition and get you targeted ads. These regimes can be insidious in their control schemes.