It is robbery because you're not paying the person that produced the knowledge, you're paying the person that took the knowledge and put a chatbot interface on it.

It's different from search engines because you're not even getting the chance to monetize it yourself, you lose the ability to even show some ad for a pittance. Hell you don't even get credited most of the time. Many many people didn't give permission for the data to be ingested and used this way.

We've come out of decades of copyright infringement takedowns and pirating lawsuits only to end up in a position where people doing similar things as a corporation are making billions of dollars.