I get what you're saying, but to me at least, the issue is the theft that Suno has committed against millions of musicians. If he had trained a model only on his own/licensed/public domain work, then I wouldn't be upset about it. In fact, I remember from back before the current hype bubble creatives using small generative models trained on their own work as fun little art projects.
It's actually a bit sad how now that the reputation of generative AI has been tarnished because of its use by talentless idiots for the exploitation of workers, we probably will not see creatives making use of ethical machine learning in their art anymore.