This happens every day, and there doesn't seem to be anything interesting about this case. It's how most situations are resolved. There are money transmitters that specialize in ransoms. They "do" sanctions checks that are about as good as you suspect they are.

Like other commenters have pointed out, it's literally a business. Most trade on reputation, so there actually is an incentive for them to take their money and abide by their agreements. Otherwise, they would have to start from scratch with a fresh identity and rebuild the rep to command their prices.