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Facebook Is Being Overrun With Stolen, AI-Generated Images That People Think Are Real
(www.404media.co)
This is a most excellent place for technology news and articles.
So? its not stealing.
They are taking an artist work and reproducing it - changed slightly. If you did that to a Disney work (AI or not) would they consider it copyright or fair use?
Depends on what you are using it for.
"The general fair use definition is that fair use is any use of a work that is not done in an effort to profit from the copyrighted work."
Source
AI companies are most certainly making an effort to profit from the content they're deriving from copyrighted works.