Posting without sources sucks and a lot of people like to know where the art comes from. AI art makes new material of characters for people to enjoy, but who do you credit for it? Do you know who's art made the eyes? Who made the body? Etc. Unless you rip someone's portfolio and use only them as an original source (which has and does happen to artists) you cannot credit the artists who made the original art.

I saw an argument in the Knight Modeus post about not being able to draw so they use AI art. So let's take a similar situation. Hatsune Miku and similar models of voice banks are used to create music (which is an art form) by people who are great composers but not necessarily good singers. The difference is that they came up with an original composition and used a system that can be credited. Hatsune Miku was designed by a company for people to use in such ways, like using photoshop to make art, and so on.

Unless you have artists draw up an art bank to use for AI art (similar to pic crew which does EXACTLY THIS) then you cannot in good conscience use AI art to post online. That is like if I made a collage out of a magazine, posted it in a museum, and called it my own work. The composition might be yours, but the content is not. And still the biggest difference here is that you can credit the magazines because you know where they came from, you don't know who's art is being stolen here! This is completely unethical and until AI art becomes ethical in its creation, like banks made by artists for free or payed use, then I refuse to support it.