A non-profit research group in Chicago is working on a tool that protects images from neural network style extraction. https://glaze.cs.uchicago.edu/ They claim that their application doesnt upload any image data on the web and does everything on local computer. The protection likely won't work forever, but personally I'll appreciate anything that puts a wrench in techbro's bullshit plans. I'd recommend using it sparingly, on random images, and mix it with results of different utilities that aim to do the same thing (if you know any). So thieves will have harder time guessing.