The artist used stolen materials to make art. The AI "artist" used stolen materials to make "art".
One makes money, one doesn't . The market has spoken. Actual artists will be able to continue on not make much money doing what they love and that is the meta of their chosen path. If you are an artist and you feel your job is threatened by AI, make better art or join the club of people who had their jobs taken by technology; you will have company. We still have cobblers, blacksmiths, and woodworkers; artists should take note of their revised business models.
It is a technology that makes a skilled process easier than it has ever been.
Is a calculator not technological progress?
Is a CNC machine not technological progress?
There is no valid argument that AI image generation is not a form of technological progress. What took an artist a half hour or a day takes an image generator minutes.