If you insert AI into your thinking process, it has a bias, for sure. It will helpfully reinforce whatever you tell it you think makes sense, or at least on average it will be interpreted that way because of a wide variety of human cognitive biases even if it hedges. At the least it will respond with ideas that are very... median.
So at each one of these tiny branches you introduce a bias towards the "typical" instead of discovering where your own mind would go. It's fine and conversational but it clearly influences your thought process to, well, mitigate your edges. Maybe it's more "correct", it's certainly less unique.
And then at some point they start charging for the service. That's the part I'm concerned about, if it's on-device and free to use I still think it makes your thought process less interesting and likely to have original ideas, but having to subscribe to a service to trust your decision making is deeply concerning.