FWIW, in Japanese culture it is not the norm to repost other people's art or photographs, especially fanart, either to websites or to use for graphics/edits/icons/etc. on Pixiv, you aren't supposed to repost any pictures (even with credit) without express permission of the artist. So the artists are uploading to a website where the norm is "do not repost this without explicit permission" and are seeing people repost it thousands of times (With reblogs, I mean) without having been asked or sometimes even given direct credit. They might not want the exposure. They might feel annoyed that someone took their art without asking. Etc. So I can understand why many of them choose to delete.
no subject