Edit: A little more detail...
For their current use of the networks, the apps aren't at all competitive with Uber Eats, Doordash, etc. See http://blog.pizzahut.com/featured/track-your-pizza-with-our-... , for example. It tracks only 3 states. The UI also doesn't do a good job of highlighting state changes...the current state is just a slightly larger circle, of the same color, and no "ping" when it changes.
Then, it seems like they could leverage their networks to do something beyond just delivering their own products. I get that there are potential issues with that, but it's surprising that we've not seen at least some local trial run of that.