I've seen a few of these pop up. They tend to be web crawlers that don't have up to date pricing or menus. Maybe an app that just opens other apps, something like that. Because these food delivery services don't have open API's.
Google has orderfood.google.com that does this, it's pretty limited in my area. Basically just Postmates and 7-Eleven Now. Very rarely you might see Doordash pop in.
It's a great idea, hopefully you've found a great implementation.
@ethan_glover Hi Ethan, you are right not all this companies have API, and was one of the problems I had initially. But then I've improve the algorithm and I can tell the results are pretty 100% sure :)