I haven't seen that idea (artists being morally bankrupt), like you I'd strongly disagree. I also agree it's a shitty situation that artists invested hundreds of hours of their own time to create something only to be repackaged and sold by some AI tool.

That said, I'd still make the same point that people who value art and the artist will buy from and support the artist. Those that don't value it, won't. But now we're on a larger scale.