It might surprise you to know that today, the main backbone of the Internet in America is fiber. The undersea cables that connect the continents are fiber. Without fiber, the Internet becomes more like the Internot.
So why isn’t fiber to the home (FTTH) more widespread? The fiber gap exists because many ISPs rely on dated copper wiring to connect back to the network. Copper wiring was a purpose-built infrastructure for telephones and later, for cable TV. It wasn’t built with the Internet in mind. It has limited bandwidth, it’s slow relative to fiber and it suffers signal degradation over distances.