I find those kinds of chatbots useful, but those aren’t the ones I encounter 90% of the time. Most of the time, it’s a chatbot that summarizes the help articles I just read, giving faulty interpretations of the source material, that then goes on to never direct me to a real person unless I tell it multiple times that the articles it’s paraphrasing aren’t helping. (and sometimes, they have no live support at all, and only an LLM + support articles)
I don’t know of any super high-quality ones that run well, but the Open Assistant project, (now archived) collected responses from voluntary participants (myself included) to build what is now considered a very high-quality dataset of chat conversation pairs, truly open source, and all voluntarily submitted instead of scraped.
The models are reasonable for fine-tuning, but aren’t very good compared to newer models from large companies.