It's harder to steal them because there is nothing to steal. The "art" is programmatically generated and can be instantly created by anybody at any time. It is like having someone steal your grocery store receipt and then worrying that you're going to starve even those the food is still in your fridge.
Screenshot.
The art is not the NFT. The person only "owns" a hash code that points to the art.
There's nothing stopping you from creating a NFT that the original author can mark as invalid.