The answer is no. Simple as that. Therapists don't have to report other therapists unethical behavior. It doesn't depend on the type of license they hold or anything else. I also don't believe there are states that have that mandate. So, the answer is pretty straightforward. Whether people are happy about that or not and whether they accept it or not is a different issue.

By the way, not only they are not required to report their colleagues, but they might get in trouble for doing so without the client's written authorization as this would constitute the breach of confidentiality.

You, as a client, are the only one in the position to decide whether your ex-therapist should be reported. No other therapist can do it without your permission.