I especially like the idea that these styles of art, ASCII art, typewriter art, teletext and others, keep coming, without influence one from the other even. Just something people get an idea to make when they site down at the machine.
Though it is still around today, ASCII art reached the zenith of its popularity before the web. It was the visual language of BBSs, Telnet, and many other pre-WWW networks. In a wholly text-based world, these works proliferated. For the brief moment that modems were the preferred mode of access to other computers, they were useful. And their sketchy aesthetic seemed right for mediums that were provisional and changing rapidly.
These things did not evolve one from the other, so much spontaneously regenerate down through the years, time and again.