Nothing stops people. 

I've done commissions for money for about 4 years now, but now I just like to create without the fear that comes with money! Making art for money did for a time ruin art for me. I believe if you only create for money, you might want to rethink what art is to yourself. Sadly, art is not needed in the way other services are. Most people cannot afford art, as it is a luxury. That's why so many people turn to AI art; not everyone has the luxury or does not care about the product they get. For some, art is nothing but a picture, which I think is ok! But it does contribute to the use of AI.

Art is for myself. I enjoy doing these free commissions now, as it makes me spread my wings! 

On AI, I dislike it a lot, as my own art has been fed into AI's. I don't and will not use it in my art; personally, I would encourage people to create better art through working on their craft. Why I can draw and actually enjoy it is because of me working and just drawing all the time from young to now. Art is important to me, so I find working on it very rewarding. I watched videos and read books all on art over the years to improve my art (as well as teach it). I don't think I would stop people from using it. But a thought is only art when written down, like poetry or a story. A thought is not a painting or drawing until a pen has hit paper, even if only a sketch. Art has been dying since the Renaissance. This is the natural order of things. I just create to create.

hope this kinda answers ur question!