OpenAI is definitely not the one arguing that they have stole data to train their AIs, and Disney will be fine whether AI requires owning the rights to training materials or not. Small artists, the ones protesting the most against it, will not. They are already seeing jobs and commission opportunities declining due to it.
Being publicly available in some form is not a permission to use and reproduce those works however you feel like. Only the real owner have the right to decide. We on the internet have always been a bit blasé about it, sometimes deservedly, but as we get to a point we are driving away the very same artists that we enjoy and get inspired by, maybe we should be a bit more understanding about their position.