A reasonable request! And if that's the primary value add of these services, I would suggest that a traditional non-unicorn SaaS company[0] could provide a very inexpensive web portal for restaurants that handles order processing, while leaving the logistics to the restaurant.

[0] https://en.wikipedia.org/wiki/ChowNow

Something as simple sounding as a menu can be surprisingly complex.

A local burger place's burger has, I just worked out, 34,832,528,367,943,700 possible combinations. Some options are mututally exclusive, some add an extra charge. Etc.

and yet doesn't their pos terminal handle all of that already?

It's all done on paper. It only gets entered into the POS as the total "Custom Burger - $17.95" soethign like that

Hilariously that's not even part of the equation - both uber eats and skip the dishes (a canadian local company) have terrible UIs.

I do love ordering via the internet without having to talk to people though... the best time I've ever seen this done was through a local VT pizza shop and the UI was pretty much just an HTML form and it was so incredibly easy to use.

That's entirely the reason Pizza 73 became my goto pizza place - it rolled out online delivery in the mid 2000's and kept me from ever having to phone again.