Putting aside the ethical issues or social implications, it's not suited to either novel writing or to comics. It just isn't fit for purpose.
Comic art requires you to draw a specific original character the same way in a variety of specific poses and extremely specific expressions across multiple pages. AI is bad at doing a specific OC, its poses are all boring or nonsensical, and it is terrible at expressions other than canned happiness, vague sadness, or blank neutrality.
There's only been one AI-made comic that I've seen that was passable in terms of quality, and after looking at that creator's process, it took so much work and art skill that he might as well have just drawn the dang thing. All other attempts I've seen at AI "comics" have been so poor that I felt embarrassed on behalf of the "creator" for being unable to tell that they were of such low quality.
It's a similar situation for AI writing. If you're using AI to write your novel for you, just don't. Authors who can't be bothered to write the novel themselves will get readers who can't be bothered to read it either. AI scenes and plots are generic, boring, and unsatisfying.
There are a few use cases for generative art and writing.
1. For dungeon masters running D&D, where you need to make some research notes to find or to write a puzzle riddle or somesuch. These things take a lot of time to format and build, their quality doesn't need to be that high, just passable.
- Caveat: Never use AI for TTRPG ideas. it is terrible at ideas. It's only good for embellishment of ideas you already have. AI generated game ideas will bore your players.
- Further Caveat: I probably wouldn't use image generation abilities for this. My campaigns are always so unique and specific that AI art cannot easily capture what I have in mind. Better to just draw the dang thing!
2. Put your story ideas into it and see if the AI writes something similar to your story. If it does, throw your story out and start over. Your story is too generic and won't hold reader interest.
3. Put your character design or other art ideas in. If AI can make what you have in mind relatively easily, then your ideas are generic and you need to refine them more!
4. Put your own unfinished art sketches in and see what it makes from them. Take things that work, figure out why they work, and consider incorporating them into your work as if you had just had a reddit thread of 1000 mediocre artists tell you what they would do in that spot. Don't put any generated product into your final art piece.
5. One-off worthless meme-level images. That stuff was slop anyway.
6. Personal use where you want something like a unique logo for your Rollercoaster Tycoon ride but it's not worth it to make one yourself.
On the other hand, the explosion of generated images has been great for traditional artists like myself because people suddenly aren't as interested in highly produced digital paintings as the used to be while their interest in rougher handmade work has increased.
And in about 3-15 years there will be a lot fewer capable artists as people who rely on 'good-enough' generative images never develop the skills to be good artists themselves. They are the real casualties of this fad. I know if I was a 15 year old I would just use generated images because they're so much better than what I could do then, and my ideas were not developed enough to care about how generic it was. Then I wouldn't have become an artist at all!
One further point - every purveyor of AI images I've seen online acts like the sleaziest sort of scammer. If you have to act and talk like a scammer to sell your services...you might just be a scammer. And I'll never be a scam artist.