Behold "Glaze", a software tool that subtly alters the pixels in a piece of art online 
...
... in a way that isn't detectable by the human eye 
...
... but renders the image useless for training a visual AI. The AI can't detect the artists' style, and thus can't mimic it and copy it. 
It's item #1 in my weekly "Linkfest" newsletter here 
: https://buttondown.email/clivethompson/archive/linkfest-6-gps-on-the-moon-8-bit-jane-austen-and/
(Subscribe here! https://buttondown.email/clivethompson)
