This post is currently making the rounds
Having worked in one such service years ago I can confirm how the math is done. No matter what service you go with, a restaurant stands to make cents of “profit” for every dollar of sales, while the costs are that much higher for the customer. It’s getting to the point where local and state governments are starting to look into it.
The percentages are lopsided to heavily favor the services themselves, and that’s by design. A lot of people have commented on this fact in a lot of places.
Do the right thing: pick up the phone and call the restaurant directly— yes, it will mean talking to someone (the horror!) but it usually will result in you (as the guest) developing a relationship with the restaurant itself. This is a good thing. You want to save your favorite restaurant, right? This is what you have to do.
A small sacrifice to help not only the restaurant itself, but the people working there.