EDIT:  They did just add a way to auto-disable the third party thing.  Go to Accounts Settings >> General and scroll down and tic on the "Add the "noai" thing.  It's something, at least.

This is the form to opt out of deviantArt's AI tool.  By filling this out, this will allegedly prevent the AI from using your style to create generated art.  However if you want third party apps to not use your art, you have to go to each piece of art in your gallery and tic off the box that says to opt out (and even then it admits that it's not guaranteed to work).

I'm getting pretty fed up with this site and not comfortable uploading my art here anymore.  I'm not going to leave yet, but... It's only going to get worse from here.  So it's just a matter of time...