I agree partially, that transformative works would be not a theft.

Not exactly everyone. I will continue to pay artists for their art. Once the AI will train mostly on derivative works produced by itself, with most artists whose work was used without asking to originally train the AI out of business, it will be very fun. Those who will be able to use all that stuff as a new kind of raw material to create pristine art will be a tiny minority, and it will really be a new chapter in the art book. For everybody else, the marvellous AI will be in the hands of the lords of social media, producing an infinite stream of uninsteresting stuff you love watching while scrolling the infinitely long page depicting the sterile desert we contributed to create teaching the machine what we like and what we don't. Very fun, indeed. An AI generated mirror of our mediocrity, with no way out. And please, don't start telling me that our brains work the same and that every piece of art is derivative work. Human beings are a little bit more complex than a neural network.

Until law makers catch up, which is a long time if there's no other negative than that some artists need to up their game or find another job.