In Germany (and probably much of the EU) that incentive is built into the law, as it should be.

I think it’s boilerplate in big company contracts there, but extremely rarely enforced, because IIRC the amount you have to pay is the comp for the job you’re blocking.

When I had a contract like that, I occasionally fantasized about getting a FAANG job and being paid in full to not take it, but in reality that would never happen unless you got caught in a spat between rival executives.