Every. Day. Every day I'm here I find art theft. Not just recolors, edits, or traces. Just straight up post someone else's art. Some are even clever enough to take them from places other than dA.
And that's just art I recognize. Lord help the unknown artist who catches the eye of an art thief and it goes unreported because nobody recognizes it.
(To be fair, it happens in other art sites too like Pixiv, and Inkbunny. But not as frequently.)