5G drastically eases the bottleneck on available spectrum. There’s tons of spectrum up in the millimeter wave bands, which means you don’t need to spend billions up front on spectrum to start deploying the technology.

At the same time wireless dramatically reduces the cost per household served. The fan-out problem for wired internet is brutal. It can cost almost as much to bring fiber from a subdivision into each house as it does to bring it to the subdivision in the first place. (It’s way easier to just string fiber along some utility poles to the edge of a subdivision than to then trench it through a couple of hundred yards.)