Pixabay and Unsplash acknowledge the photopgraher, or they are supposed to, and people can get into troubl for violating copyright.

I don't support people who use AI, because that's plagiarism which is a HUGE difference to free images. Do you want people to take your original work, mash it with other stuff, and pretend they made it? I sure don't.

Maybe when AI starts crediting all of it's sources then we can start pretending it's a moral choice.