I have not heard of your project before I saw your tweet today. I think steemit has some help for this problem. Some programs I have seen keep blacklists. I think it is done with something called sql - I'm not tech-y, but I'm pretty sure you can do it and then you will not have to deal with criminal art thieves in your tag.

I consider myself an artist but I know nothing of crypto and have no art on it. If I see creative commons art on any steemit post - attributed of not - I do not support the post. Anyone can do better than that - artist or no artist. If someone is using cc art, I don't bother reading whatever they wrote. This is my prejudice after working online for few years, but I know I am not alone.

Good luck - there is a lot of interest in crypto these days, so if you are able to ever get some good art going you might get some traction and attract artists to try to post here. I've got at least 1000 artists in my twitter connections. Maybe some of them would be interested if they saw good tweets, so I will look out for them now.