"it means those nets are not illuminated for common web tools"
Um, no. It comes from the "
Darknet paper". There's absolutely nothing there about common web tools.
Google indexes half of them, and uTorrent and eMule index most of the rest. And basically every single one of the generation now teens? They get them. They've grown up with ubiquitous computers. The older people who don't are a shrinking market.
It's the bear in the closet which publishers with their instance on DRM are refusing to acknowledge is there.