Because I'm mainly interested in porn arts (and non-porn ones, too) that are not of some original characters, but of ones from whatever anime I'm watching, or whatever game I'm playing at the moment. And I tend to mostly like (and therefore want to see pornographic arts of) characters that aren't exactly popular, so it's either "find a random tumblr artist with the same shit taste in fictional characters as me and enough skill and acceptance of the character just the way that character is to produce something I can enjoy", "stare at the same 2-3 works found elsewhere FOREVER because nothing new is going to happen. Ever. The fandom died years ago and only few people haven't got the memo and keep contributing. And they happen to be on tumblr" or "learn to draw well enough that my works would match my standards" (and that last one is not an option. I'm not staying in the same fandom for, like, 10 years it'd take my skills to match my preferences).

So, Tumblr it is. And yes, the block list of the account I had pre-purge contained mostly the shit artists and ones (regardless of skill and art style) who felt like slapping a cunt and the stitches on every canonically-male character they laid their eyes on (now it's mostly just shit artists), but after I blocked all that displeased me what was left was pretty good, actually.