This is how we lose

Do not dilute the goal. Thieves have never cared about whether or not you consent to them stealing. Changing the demand from disallowing AI imagery to "automatically say please don't steal from me" is guaranteeing that nothing meaningful gets done. They already took your art without asking. They're going to continue using the data they generated from your stolen work. They will not care that you ask them not to take your work. They will still take it and you will never be able to prove that they did. AI art needs to be blocked from Artstation. Diluting the goal like this is only inviting meaningless action to be taken and will achieve absolutely nothing.