The French minitel in mid-80s was successful also thanks to online porn. It was not using the internet (not TCP-IP network), but it was pushing the ASCII art to its limits :)
https://www.latimes.com/archives/la-xpm-1989-10-24-mn-718-st...
and it made some people rich https://www.the-independent.com/news/world/europe/le-monde-t...