You may have noticed an elephant in the room missing: Credit. I generally think crediting is good and you should do it. I also recognize bibliography is work, and don't begrudge people who don't.
BTW: people sign their work to remove the work of crediting for future reposters. Signing your work is so people can repost without needing to credit you - the credit is baked into the art!
Have you seen art like this?
Why do you sign your work if you don't allow reposting, and you put the big "donut repost" on the art as well! Whats the point, to add as many ugly watermarks as possible? Christ almighty. I block every artist who does this tedious shit, I fucking hate it.