I don't think it's a bad idea but it's largely dependent on the crawler. I can't speak for AI based crawlers, but typical scraping targets specific elements on a page or grabbing the whole page and parsing it for what you're looking for. In both instances, your content is already scrapped and added to the pile. Overall, I have to wonder how long "poisoning the water well" is going to work. You can take me with a grain of salt, though; I work on detecting bots for a living.