Germane. And this is still a disengenuous argument wherever someone is making it. We should not defend corporate exploitation of millions of people by citing how human beings do things. Making it harder for artists to make a living by beating them over the head with their own work does not "enable way more creative expression". Writing a prompt hardly counts as "creative".
Open models exist because silicon valley corporations with massive VC funding or institutional capital like Meta and Google stole millions of works from across the internet. Abusing the reputation of open source software does not mean you had permission to use that art in your model, and it doesn't wash away the ethical stain on these models.