When given the right prompts, LLMs can be very effective at therapy. Certainly my wife gets a lot of mileage out of having ChatGPT help her reframe things in a better way. However "the right prompts" are not the ones that most mentally ill people would choose for themselves. And it is very easy for ChatGPT to become part of a person's delusion spiral, rather then be a helpful part of trying to solve it.
When given the right prompts, LLMs can be very effective at therapy. Certainly my wife gets a lot of mileage out of having ChatGPT help her reframe things in a better way. However "the right prompts" are not the ones that most mentally ill people would choose for themselves. And it is very easy for ChatGPT to become part of a person's delusion spiral, rather then be a helpful part of trying to solve it.