My take on it is that: when big corporations are doing it for (direct or inderect) profit it's stealing. It was trained on the work of artists after all and that's the only reason they can make good images. If they can make a model that doesn't require using images from others it would solve that issue but at least under capitalism that is too expensive to happen now so it won't happen.
Personal use can be fine I guess and can even allow for more creativity, like if people are using image generation to make new images/art/assets based on their own work/photos. An indie game/movie/etc where the person uses AI to expand what they can do in size is a great use of AI I'd say, giving someone the ability to do something bigger/better than they could do by themselves is what a tool should be like and gen AI should be such a tool for artists too.
There are more cases but they might be harder to come to a conclusion on, specially as they exist in a capitalist setting.
Can't wait to see what secondary effects all of this will have.