There's plenty of great applications, but it needs to be heavily regulated to not be a privacy nightmare.

Maybe also give certified drones a specific bright colour that privately owned ones can't have so you know it's not some creep or creepy advertising company operating it.

Because it's much better to deliver like this than have the city clogged up and polluted by cars delivering a tiny bag of food. Even more important, medications that are needed urgently or just for someone that's too sick or elderly or disabled to comfortably pick it up themselves.