I think that is a fair point which I wasn't really accounting for. Doordash should really get permission from restaurants before inserting themselves as a middle man, even on a trial basis.

Also, it occurs to me that if the artificially low prices resulted in doordash recieving more orders than would be usual, I doubt they would have disclosed that in their dealings with the restaurant. Though that is hypothetical and still suffers from the two wrongs don't make a right issue.