If they had to pay for all the content they take/use/redistribute they wouldn't be able to make enough money off of your work for it to be worthwhile.
Together with websites that make money off trying to report the truth shielding their content from plagiarism scrapers, this means that setting up a wide range of (AI generated) websites all configured to be ingested easily will allow you to alter public perception much easier.
This spec is very useful in a fairy tale world where everyone wants to help tech giants build better AI models, but also when the goal is to twist the truth rather than improve reliability.
Oh, and I guess projects like Wikipedia are interested in easy information distribution like this. But you can just download a copy of the entire database instead.