Well, it's not because I'm against AI in general, but I do think it's swindling. Anyone can give up some pointers to AI and see if it produces some usable art, so selling that is just a lazy way to get money out of other people's pockets. Sites like itch should ban the practice (revoking the responsible account on the spot).
Games using AI assets, is also an idea I don't like but if the game itself is at least a creative piece of work, at least we got something.
An entire art bundle with AI pictures, that is just cheap. If I were to buy art bundles I would pay for the effort it took to create such a bundle.