They write page after page of content that barely get read. It all just exists to make the google bot happy. And that works. They bring in more customers & revenue apparently. (honestly, I wouldn't be surprised if it's all wasted and the added revenue is due to the better website and backoffice, but what do i know.)
So it seems only natural to have AI generate that content for the Google bot and stop wasting all this effort. Obviously I can't prove nobody reads this content, but seriously.. A landing page about hot-tubs and how cool it is to have one in your holiday home? Doubt that anyone actually reads that..
EDIT: I guess my point is also: it's already flooded with crap, just look at al the blog spam for things like 'how to start nginx'