My ISP would certainly love if my whole local area (building/street/district/whatever) only fetched each unique piece of data once through their network and the

My ISP would certainly love if my whole local area (building/street/district/whatever) only fetched each unique piece of data once through their network and then distributed it locally via mesh networks. It's just that they can't make it happen by themselves. It needs to be supported by network protocols, which need support from content providers and content consumers as well, so it goes way beyond the reach of ISPs.