It doesn't matter if 10% of users quit using it if the stolen tips from the other 90% more than cover it. And where are you going to run? The competition isn't any better.
I think that's very cynical perspective. Probably you are correct, but if they were all corrupted, I could try starting my own. I'm probably naive but I still believe being ethical and profitable at the same time is possible.
Just buy food physically, or call up the eatery and order on phone directly?
You don't _need_ the competition, either. Just pretend it's 2005 and acquire food some other way.