Is it POSSIBLE? Absolutely, there's nothing stopping you from wide format printing a bunch of images and hawking them at the local flea market.

Is there anything stopping you on the internet? Lots of places keep putting up 'no AI allowed' rules. These rules somewhat-stop you from doing AI-related business on their sites. A lot of these computer art sites don't deal in physical fine art paintings either, they're just the Wacom Tablet art outlet.

AI artists will have their own outlets in the near future, and people who are highly skilled in writing prompts will be able make some money prompting stuff on command for the clueless majority. People who are good at processing AI output in various ways will have an even larger market, "take this image collection you make and put it into my XYZABC123 for me."