Re: it is only fair that we fine some of theirs back!
> They're being fined for illegal behaviour
As were the european companies. With any global company you can always find some wrongdoing somewhere. The only question is how to deal with it. Whether you try to correct it, mitigate the damage, or just treat it as an opportunity to get some "free" money.
And fining foreign companies really is free money. It costs the prosecuting country next to nothing and causes them little or no hardship.
The UK seems to think the ignominy of being found to be breaking the law [ sharp intake of breath! ] is enough - the UK fined Facebook half a mil (how they must be laughing now) - and presumably paid that with Zuckerberg's credit card. And forgot about it just as quickly. But at the $ billion level, the cost becomes noticeable, starts to act as a deterrent for next time and the restitution could actually do some good - and not just with drinks all round.