Artist Jingna Zhang built Cara, a platform explicitly intended to protect artists from having their art stolen by AI...and yet these people just won't leave them well enough alone.
All the images on that page have been Nightshaded. Apparently it's noticeable on images with large flat sections of a single color, but only barely. You probably won't find many before and after examples fir obvious reasons, but it's free though, so nothing to lose in trying it out yourself