How could it be otherwise? Those artists aren't expressing themself. They're expressing somebody else's idea as described through a short prompt.I know of at least one artist who has compared taking commissions to being a generative AI.
If art really is supposed to be as much about personal expression as people here are saying then it follows that taking comissions makes you a sell out (and that doing it for a corporation is equivalent to selling your soul to the devil; you've taken something that is - allegedly - supposed to be intimately personal and traded it away for money to something that isn't even human.)