It's a courtesy for the delivery person, so they don't have to ring and wait for you to get to the door. Instead you get a notification when they are getting close to your house (via GPS tracking).
Wow. That's… Totally not done here in the Netherlands.
It's not really an issue either, because doors are typically within a few metres from the street, and people answer fairly promptly when food was ordered (because you are hungry and your food is there, which would seem obvious).
