That sounds like an impossible solution to reach mass market. Simply because regular internet for most people is just the internet company comes and connects it to their computer.
I don't know, I definitely overly simplified the task but
https://en.wikipedia.org/wiki/Guifi.neta spanish mesh network was born in 2004 due to lack of service from said ISPs and in 2018 this network continues to grow to this day - "over 46,000 km of wireless links" that seems pretty large scale.
110 new nodes last week
https://guifi.net/en