I don't think anyone is 'kept' in therapy. At least I hope it is always clear that being in therapy is a choice unless legally obligated.

There are different kinds of therapies. Some very specifically teach skills and some are ongoing explorations of one's self that includes depth work and seeing how new things that come along, as they do all through one's life, affect us.

I haven't had an experience with an unethical or incompetent therapist, and I wouldn't be able to judge a therapist's ethics or competency without knowing all of the facts, which only the therapist would know.
I think it could be easy to misinterpret dedication and desire to heal with something else, and something like a high degree of distrust or suspiciousness by the person interpreting could influence the conclusions reached.