That makes no sense. You require PoW before providing the information, not when the page is already sent. For a large code repository like GitHub for LLM training, it's also trivial to just git fetch to scrape. The simpler explanation is that modern web devs are frequently incompetent and can't get static text to appear on an idle page without pegging cores, can't get subsecond server page generation for simple CRUD, etc. This was the trend before LLMs were ever a thing.