i dont think its based on completely % of invalid cause my friend who lives in Albania got 1.2K and invalid was more than 900$ .. hours back he got PIP
10% is a lot, and your friend got like 75%.... shocked he didn't get banned... but i guess Google can tell if it was him, or just some assholes...
no your account are not blocked yet, if you are not receive any e-mail from google. please tell me your previous month earning ?