It does have something to do with the art market as well. Not the first time this discussion pops up, and I would warmly recommend to check out this interview with Gerhald Richter (who is actually extremely talented in terms of composition and color)
A bit more oriented on the likes of Firefly/True Detective when it comes to series, but if I had to run an animated series campaign it would be an Avatar one, hands down!
Pretty much every roleplay fandom under the sun. All the classic tabletop settings (d&d, ravenloft, planescape, a pinch of dark sun, star wars, vtm, cthulhu, cyberpunk... ) and every manner of experimental roleplay on homebrew, games and series.