At the size / scale of grubhub, it will always be cheaper to do unethical things for money now versus settling out of court later.
Knowing someone that used to do sales at grubhub, this doesn't surprise me at all. The company that person currently works at is probably doing the same, because if you can get away with it, why not? Worst thing that happens to the people who put those policies in place is they find another job.