Fuck AI

this would stop an artist sending someone else to a con to sell their works if they cant make it themselves.

This point has nothing to do with identifying AI ~~sellers~~ scammers. Real artists already have to notify and confirm with the organisers if they'll be attending or if someone else will be (due to them having different passes and access), this changes nothing.

Or would be fairly easy to spoof, maybe the guy selling AI can actually draw well enough to put a rough sketch down, or can pull someone elses vod as proof.

If the person can draw well enough for that, then I have this stupid faith that they would rather pursue that high of drawing by their own means than to rely on selling shit. If they play someone else's VOD... I find that hard to achieve, since most either show a webcam or an avatar of some sort, which can be identified and then check the socials which can lead to them saying if they would be attending or not. If they show a cropped video/image... well that just would make it worse for them.

Like... yeah, if the organisers are idiots or plain don't care about the event, then I can see these kind of things happening, otherwise it's such a huge stretch that I fail to see the problem.

I dibt think artist shoukd have to prove that though.

They don't have to. But if they don't prove that they made it themselves, they're going to face a serious loss in reputation and sales in the face of a public that's getting tired of AI slop.