It probably can be simplified to writing an algorithm which detects that image was generated by AI (like https://deepmind.google/discover/blog/identifying-ai-ge

It probably can be simplified to writing an algorithm which detects that image was generated by AI (like https://deepmind.google/discover/blog/identifying-ai-generated-images-with-synthid/ https://deepmind.google/discover/blog/identifying-ai-generat...), and consider all AI-generated images as bad for training set by default.