I wish there were a handbook on therapy for people to know what to expect of a good therapist, something more than the 50 signs (or whatever it's called) of a bad therapist. I was so ignorant about therapy and vulnerable and used to being manipulated irl that I could not have stopped anything. I did have one or two that were clearly competent and would not do something like the OP is asking about, but there's just not a lot of regulation or oversight in this field and many people who are seeking help (speaking for myself) don't know enough to put up boundaries.

I would love a handbook by stopdog. She could call it something like Stay Back and Don't Do Things at Me: How to Deal with a Wily Therapist