They have your delivery address and phone number; it’s trivial for them to identify you uniquely. What they gain when you install an app is the ability to tie t

They have your delivery address and phone number; it’s trivial for them to identify you uniquely. What they gain when you install an app is the ability to tie that identity to information about your responses to ads, your social media activity, your browser history, etc. Pizza Hut may not have much direct use for most of that information, but they can sell it.