Gore such as that (Guro) is incredibly common on Tumblr and Pixiv, it is considered pornographic as Guro is made specifically for sexual purposes even if it doesn't appear purely sexual at first glance. DA is much more on top of cutting out harder Guro images, but the tag still exists and still contains content.
When you get to websites that are more lenient, such as Tumblr and Pixiv, you get plenty of it, and its sub-genres, Guro, Candy-Gore, Hard Vore, Pastel-Guro, etc, with the exception of perhaps Candy-Gore, Guro and Hard Vore are considered gore, but it's also considered gore made for sexual purposes. Guro is actually huge on tumblr, you likely simply didn't find it because despite its sheer amount of content, it remains relatively well contained in its own tags.