[falsaberN1]

I'm sorry to inform you that the mere automated pre-processing used in building of a training set will most likely disable any form of poisoning because the image is being altered before training. All popular training tools do this.

Art stealing is a thing. I've had by art stolen regularly. Multiple Doom mods use sprites I made and only one person (the DRLA guy) asked for permission. I've had my art traced and even used in advertisements with me only finding out by sheer chance. I've had people use it for coloring without crediting the source. This has happened for more than thirty years. You can only learn to live with it, lest you risk going absolutely insane. If you are popular, people will do stupid stuff with your stuff. And if you aren't popular, you art is not going to be used to train, anyway (sets are ordered by popularity and only the top stuff gets used. The one with 3 upvotes is not going in.)