Slice is a delivery platform that focuses on mom-and-pop pizza places. At least when I was involved years ago, they only charged a flat $1/order fee. They helped stores get their menus into the system, and then stores did their own deliveries. This model worked well because a lot of pizza places already had their own delivery drivers—probably more so than any other restaurant type.

I used to use Slice to order because the extra cost was nominal, and the drivers were local and worked directly for the pizza place. Issue with your order? Tell the driver, or tell the store, and it'd be addressed immediately, by real humans. Need to make last-minute changes to your order? Call the place directly and talk to a human. Get to know your driver because it's the same person most nights. Lots of upside.

Except everyone used DoorDash and GrubHub, even though Slice was both a better user experience and a far better experience for the restaurant owner. Slice cost restaurants less, cost consumers far less, and was a better solution in every way. But because the vast majority of the restaurant's deliver business came through DoorDash and other large delivery companies, most small restaurants have gotten rid of their own delivery drivers.

Slice still exists, but I expect it won't experience much growth. The big guys are dominant.