"Good luck with your European Operating System. Whilst it may not slurp your data to advertisers, it will slurp your data to your political masters, the EU."
They may rail and argue and fight through the courts, but no US multinational already trading in the EU is going to pack up and go home, leaving what is pretty much their biggest single market (bigger than the USA) to the competition who WILL accept the laws and regulations and fill the void. MS broke the law, got fined big time, eventually realised they would have to suck it up and got right back to business. Why would Google or others be different?