Being discoverable is one thing, having your content stolen wholesale is another

Most of the economy is not journalists or people who sell "content" online. In most cases I can think of - retailer, restaurant, hotel, plumber, any local small business, they want their content ingested. That means the AI chatbot knows about them and they can be in answers potentially.

And having your content rendered inaccessible to humans by a DDoS attack from overly aggressive webcrawlers that ignore robots.txt is yet another.