I am working on my own AI Therapist right now to assist in the real therapy that I'm undergoing. It runs locally on my own machine, and with some tailscale, I also have access to it on my mobile devices.

I would never use an external system for this. Even ignoring the privacy issues, and they are plentiful, it makes a lot more sense that you tailor the AI therapist to your needs, which most of the time are not generic needs. If you're in a therapy program you probably know those needs better than most people and can concretely ask the AI to assist you in meeting them over a longer period of time.

I'm happy with my system, it's a little clunky still but it is doing the job in assisting my recovery, which is all I want.