A few years ago I learned that the only thing keeping me on 20/2 ADLS was a few 100 meters of already built but empty cable channel. I easily could buy that much fibre, borrow a fibre splicer and cable puller, patch it up to a relative in one of the already wired buildings and share their gigabit link with my entire apartment building. Half of my building was on the ISP that owned the empty channel, so moving to a competitor would've directly hurt their bottom line.
Except that opening the manholes is a crime, using the ISP's channels would be at least a civil cause of action, laying such infra requires a municipal permit... The ISP was not worried about such "competition".
Now try doing this in the US, the land of endless red tape, NIMBYs and HOAs. And without having an already dug cable channel. Sure, that's going to scare the probably multi-billion-$ incumbent ISP...