Just the training. Training off of the internet! Filled with extremists, made up nuttery, biased bs, dogma, a large portion of the internet is stupids talking to stupids.
Just look at all the gibberish scientific papers!
If you want a hallucination prone dataset, just train on the Internet.
Over the next few years, we'll see training on encyclopedias and other data sources from pre-Internet. And we'll see it done on increasingly cheaper hardware.
This tiny branch of computer sciences is decades old, and hasn't even taken off yet. There's plenty of chance for new players.