And before the obvious comments on how GenAI is creative, then please do this OpenAI and Anthropic, for your next LLM. Just teach it Python, C and Rust and give it some good books. But dont give it access to Github...lets see what you can do then...
AI companies are also working to integrate training with real-world experience through sensors and robotics, to shrink the gap between human experience and hallucinated LLM experience.
They all have archives of pre-LLM content. There's also archive.org, google books, and pirate ebook archives. I don't know what they're doing to build video and audio archives, but judging from the cost of spinning rust, they're storing significant quantities of that, too.
Some parts of the internet are curated, and even with LLM influence they're still worth training on. I doubt wikipedia or stackexchange or rosettacode will ever cease to be useful at all.
Going further, current LLMs have at least an order of magnitude more computing resources, but completely suck at go. Why would this suddenly change unless we dumped the countless games played by alphago for them to train on?
It can either examine the ground truth source code to answer your question "How to expire cookies using RoR Devise gem" or it can read docs for you or it can spin up local experiments to black box examine some software. If humans had done that before posting on StackOverflow, the question never would have made it there.
Its reasoning ability is long passed hoping an example exists online for it to copy.
Whether that's possible is something we'll discover, but no one is throwing billions on AI companies for the hope of them building a giant natural language queryable internet information repository.