Kasumi uses the MistV2 adversarial AI tool to protect images from being used in AI training programs. From the MistV2 project:
By adding watermarks to the images, Mist renders them unrecognizable and inmitable for the models employed by AI-for-Art applications. Attempts by AI-for-Art applications to mimic these Misted images will be ineffective, and the output image of such mimicry will be scrambled and unusable as artwork.