i mean.. try using it for even simple stuff like designing code. Often, ChatGPT creates a fantasy library that does the task you ask chatgpt tk do.. the library don't exists, but chatgpt writes you code using that fantasy software library. Same with program functions who don't exist.
Same happens with stuff like People, telephone numbers, locations, books etc.. tons of fantasy stuff.
LLMs aren't trustworthy for such stuff if you need real info and not just creative help with fantasy stuff. And even for those tasks it is usually not really good enough.