I could see that being the case. I don't think they understand how infuriating it is on the consumer side.
Maybe publish some success stories citing the amount of increased revenue.
Another idea would be to build your own index/app of restaurants with mobile friendly sites so there's double incentive for them to sign up.
> Unlimited promotions, events and discounts with scheduling
Maybe you have this already, but a local restaurant here has a promotion where you sign up via email/SMS and they raffle a free pizza every weekend. Since they're also a bar, this helps get people in the door and spend more money.