Interesting one, thanks. By the nature of it that art community excludes huge areas of art (concept art, performance art, land art, …). Basically anything that is not a 2d image (sometimes animated) on a screen. To me it matches exactly what I meant with the first type of art, although I admit it is a crude categorisation.

If they charged a small amount per submission probably the would stop users submitting 40 images per second.