It seemed obvious to me for a long time before modern LLM training that any sort of training of machine intelligence would have to rely on pirated content. There's just no other viable alternative for efficiently acquiring large quantities of text data. Buying millions of ebooks online would take a lot of effort, downloading data from publishers isn't a thing that can be done efficiently (assuming tech companies negotiated and threw money at them), the only efficient way to access large volumes of media is piracy. The media ecosystem doesn't allow anything else.