What are some signs that a therapist may have poor boundaries with their clients?

Routinely going over the time limit with certain patients, compromising the time for the next client.

Sense of competition with persons who are important in the client’s life.

Obsessing about clients outside of work hours.

Is there any evidence to support the existence of people who have experienced "gangstalking"? Or is it a psychological phenomenon?

Frequent phoning or texting of clients to “check up on them and make sure they’re OK.”

These items can happen fleetingly, briefly, in any therapy, but if they’re frequent, it’s definitely time for the therapist to get some good, solid supervision/consultation.

Serious disappointment when the client cancels a session.

How do Greeks identify themselves in terms of civilization? Do they feel more connected to Western or Middle Eastern civilization and why?

General Introduction to Boundaries from Panahi Counseling:

Failing to mention the client in supervision/consultation, out of fear the supervisor/consultant will advise return to ordinary healthy boundaries.

Eager anticipation (or anxious anticipation) of the next session in ways that distract.

How do you like to be pegged?

Disclosing feelings, fantasies, and experiences to the client in ways not related to the work the client is engaged in.

Off the top of my ancient head:

Session-expressed curiosities about client details not relevant to the therapy.

Why do flat Earthers run away like whipped dogs with their tails between their legs when asked simple questions that expose their delusions as fantasy?

Struggling with fantasies of deeper connections with clients, whether sexual or parental or other intense or intimate relationships beyond psychotherapy.