Sure, sure, but that's why you might take a commute which is two hours each way instead of one which is eight hours each way. That doesn't remove the perverse incentive, it just attenuates it. Eventually. And generally not before you're doing something quite inefficient.

Notice that you're also e.g. screwing around on the internet on the train instead of screwing around on the internet at home. People regularly already do that for four, five, six hours a day. Who wouldn't choose to get paid for it?