Tech is not a neutral force.
In TechCrunch, Josh Constine delivers a manifesto. It's against startups which, he says:
" ... exploit small businesses and public infrastructure to make a buck and aid the wealthy."
One he cites is ReservationHop. It books fake reservations at San Francisco restaurants, then sells them for five or 10 bucks. But what if the spots don't get sold? Then the restaurant is out of luck. That means the owner, chef and wait staff are cheated out of their livelihood.
Here is Constine's article.
Can restaurants push back on unethical tech? Yes. And they will have to.
For example, they can require a non-refundable deposit with the reservation. That will go toward what's ordered or part of the tip for the wait staff.
It's up to the institutions of society, ranging from businesses to the courts, to determine what the ethics will be for any technology.