I've only personally seen it used to aggregate and summarize data-sets. Google search, Amazon questions about a product. It was decent for Google search but now they have cranked up their anti-bot detection and I am a bot to them so I have blocked all their domains.

For me personally big-data LLM on most sites are missing:

- debugging showing me where it found the data, how it arrived at an answer including what sites it scraped.

- ability to say "I don't know" or "no conclusive results" or "too many conflicting results"

- display of confidence level. "45% chance I am high or hallucinating a.k.a. guessing"