I have zero confidence in tech companies deploying broadband or last mile internet infrastructure, but I do have faith in municipal broadband taking off in communities with activists supporting it. You don't need FANG deep pockets when you can issue your own muni bonds to fund the network deployment.
I'm not against home made networks (see: your Detroit youtube video), but you need more formality (ownership entities, local gov partnership/sponsorship) to ensure a high level of service, community buy in, and financing.
https://muninetworks.org/communitymap