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Yes

Yes, although workarounds exist, but not in a way that would make this sort of employment possible.

I would say yes and no. If you (the employee) are heavily invested in the success of the company because you have a lot of stock options, or its success would look great on your work history, or you lied about having certain skills and now you have to work double to get the job done while learning, then you might decide to put in crazy hours. But that is a don't ask / don't tell situation. If there is any record that management knew you were working 7 days straight, then they would be in the soup. But ultimately this gives the power to the employee. At a previous company where I was that overworking employee, management tried to force a new oncall rota onto the whole team which clearly took the piss, I was able to pull on the ripcord and say "fuck, no". Unfortunately this put more pressure on the US team. And if management try to fire you in Europe they better have a better reason than "wouldn't work longer hours" or "knows their rights", so you're protected when you do raise the concern.

As an employer, you don't want to be on the bad side of labour court.