This is basically an ad for fine-tuning as a service.

Can anyone offer an example of a free public-facing LLM which has been fine-tuned by adding much specific info about some narrow area? Say, one that knows all the PR about some car brand or fandom? Somebody must have tried that by now.

The only known to me is LLaMA 2 to remove censorship using LoRA.

There are tons of them for other models, often Alpaca or LLaMA.

This is a popular tool for finetuning Alpaca:

https://github.com/tloen/alpaca-lora