Interesting question. I would guess no, but maybe “big brother” is tracking because they seem to track everything. It isn’t the job of the therapist to play detective, but simply to work with what the client presents. Many people have multiple face-to-face therapists, anyways. If one wants and can afford to do so, then go for it. It might be a common courtesy to let the Ts know there are others, though, and to give them a better perspective in order to receive the best treatment for any such attachment issues.