That it would just come up with random false facts about something as common and "basic" as the history of the Greek language sounds like a made-up issue.
Chatbots are great systetising in areas where there is a strong open source like culture - a lot of people writing tutorials and on stack overflow. The moment you move into area that is not popular to write about, they start making stuff up.
And it sux massively. I would much rather seen "I don't know" then what ChatGPT produces currently.
Since there's no actual knowledge on the part of the AI, it doesn't know that it's doing it, so it's not malicious (the designers are a separate question). But it is still entirely possible, and even somewhat likely.
It’s kind of terrible.
But yeah ever since I could start adding “and include an explanation with citations” to my prompts I’ve not had an issue with hallucinations more than once or twice.
If I’m using it to make purchase decisions or scheduling my day then I use it purely to find me source pages.
It’s really terrible at calculating the cost of services.