I disagree. In the case of this submission, the restaurant was getting negative reviews due to poor delivery (e.g. not keeping food warm) - all of which were the fault of DoorDash, and the restaurant had no control over it.
Doordash is exploiting and harming the restaurant so that Doordash can make money. I think it's totally fine to make changes to your own site to thwart this. Doordash is in full control of this. They're the ones scraping the site, and they're the ones who should pay the price if they do a poor job.
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.
Doordash is exploiting and harming the restaurant so that Doordash can make money. I think it's totally fine to make changes to your own site to thwart this. Doordash is in full control of this. They're the ones scraping the site, and they're the ones who should pay the price if they do a poor job.