I'm very skeptical about such systems, although they note that:

> You can crop it, resample it, compress it, smooth out pixels, or add noise, and the effects of the poison will remain. You can take screenshots, or even photos of an image displayed on a monitor, and the shade effects remain

if this becomes prevalent enough, you can create a lightweight classifier to remove "poisonous" images, then use some kind of neural-network(probably an autoencoder) to "fix" them. Training such networks won't be too difficult as you can create as many positive-negative samples as you want by using this tool.