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Data poisoning: how artists are sabotaging AI to take revenge on image generators
(theconversation.com)
This is a most excellent place for technology news and articles.
If the individual images are so unimportant then it won't be a problem to only train it on images you have the rights to.
They do have the rights because this falls under fair use, It doesn't matter if a picture is copyrighted as long as the outcome is transformative.
I'm sure you know something the Valve lawyers don't.