As far as kids using it as a learning tool which was kinda the original point:
100% yes! Not to the exclusion of teachers, but as a teaching aid that is 100% available all day every day, with infinite patience and willingness to talk, listen and explain - yes!
Hmmm, I can concede that it might be useful as an aid in teaching. As a language model, ChatGPT does have its uses in language-related areas, I agree. For instance, I translate documents for a living, and I have used ChatGPT from time to time to give me some hints when I run into a particular thorny sentence. Someone else here also wrote that it could be useful in learning foreign languages—again, sure, that's possible.
However, that also assumes that the teachers and the students are able to take responsibility and recognize that the tool is fallible. I'm willing to excuse it for being fallible. What I take issue with is the fact that OpenAI has removed their disclaimer of fallibility from public view. So many people are using LLMs now as replacements for search engines, which has never made sense to me. The technologies are vastly different, and the results are significantly different. For people who don't recognize this, I think there are dangers in using it. For instance, students might think that because ChatGPT gives them a perfectly natural-sounding English summary of their homework, they can trust it and use it as-is.
The LLM has become not just a springboard for learning and creativity, but a very real excuse for not learning and just letting the technology do the work for yourself. Even some of Apple's ads for Apple Intelligence in recent months have tried to (humorously?) illustrate how people can just let the AI do the work for them and all will be well.
As far as an LLM being a teaching aid available 24/7, sure—you could apply that to any software solution. Computers are supposed to do our bidding—that's what they are there for. Their "patience" with us is because we have designed them to be that way.
I have not tried to learn any subjects besides language from ChatGPT, but I wonder how far I really could go. Actually, I have created quizzes with ChatGPT before regarding music production technology, one of my interests. It does all right with most of them, occasionally throwing in some false information that raises an eyebrow. That's an educational application, but I wouldn't say that it should be used as-is.