Absolutely nothing stops you.

Thanks to AI, where no true creativity has gone into the process of writing, it has no inherent value nor creator - for all intents and purposes, it may as well have suddenly apparated into existence. As soon as it gets created, it’s an “early bird gets the worm” type situation of staking a claim to ownership. Like a car that suddenly manifested into the world, created by no man, made of no man’s materials - it’s a free-for-all.