I think everyone is really bored about the constant debate about AI or not AI.
But just consider that you may not be a full AI user or a full-manual-traditional or digital-natural-painting user.
You may use all available tools that exist in the moment you live, and mix it all together, using one at a certain step of creation, others later. That's what most people will be doing in a few years (others will stay with what they use of course).
You can start by an AI image, then paint over it, recycle it again through AI, then return to paint on it.
You can even use the part of the datasets that have to do with public domain classical styles.
You can also use AIs that are ethical in all its stages as Microsoft's Bing.
Or Mitsue-diffusion that only uses CC0 or Public Domain, donations, etc.
And you can train your own styles.
Or create them from your own images, colors, combinations of your works.
You can do all that.
Then what are you? What will be the majority of creators in let's say 5 years? They will be AI users to you, or won't be artists? They may be using AI + all their other skills together. Then what sense will have to separate or tag them?
On the other side, for assets, I am all agreeing with that, as there is always a bunch of people sending bad stuff flooding everything. That should have its limits.
But on a final product, a game, I think there is no sense in that.
I think the focus should be in no-flooding, and not in no-AI.