If it's a community being built out along solarpunk lines, then there's likely other infrastructure that has to be laid in the ground, like power and water. That being the case, you should be able to wire up most dwellings and not have to deal with the issues around wireless networking.
Then there's external connections from that community to others. It shouldn't be difficult to get 1Gbps within a community, but it's going to be far, far less between communities. The idea of a CDN helps here, but in a mutual aid way where everyone pitches in to cache content locally.