They're so far into this that their CTO co-authored a borderline dishonest study which got a ton of traction last summer trying to discredit GPT-4: https://arxiv.org/pdf/2307.09009.pdf
I recently tried to ask Google to explain to me how to delete sender-recorded voice-message I had created from WhatsApp. I got totally erroneous results back. Maybe it was because that is a rather new feature in WhatsApp.
It would be in the interests of WhatsApp to get accurate answers about it into Google's LLM. So Google might make a deal with them requiring WhatsApp to pay Google for regular updates about the up-to-date features of What's App into Google. The owner of What's App Meta of course is competition to Google so Google may not much care of providing up to date info about WhatsApp in their LLM. But they might if Meta paid them.
Finetuning makes sense for things like embeddings (improve RAG by defining domain specific embeddings) but doesn't do anything useful for facts
DBRX does not compete with GPT4 or even Claude 3.
Given the conflict of interest and background of Zaharia, it's hard to imagine such an immediately obvious source of error wasn't caught.