In NYC at least (admittedly an outlier in the united states), most apartments don't have doormen and there's no place to leave packages and package pickup locations are almost uni formally in warehouse districts/boroughs hard to access via public transit
I actually had thought of a variant on the idea, but never implemented it. I love it, and would like to have it implemented here (maybe if things are going better for me next year, I could partner with them :) ).
