I don't know. Maybe because of being sued for slander? Even if you want to come back and say, "well they did this or said this when I worked there," It's your opinion. They may think that YOU are the toxic person and were impossible to work with. That would also be an opinion.

If you were harassed, your legal recourse would have been to file a grievance and start the process for a lawsuit. Once the lawsuit has been settled, there may be language that prohibits you from talking about it with others in the field, idk.

Best thing to do is to focus on your new job and forget about the jerks you left behind. I mean, if you want to vent to family members or a close, trusted friend, fine. But, be careful of spreading general gossip if it could hurt that person's career in any way.

If it makes you feel any better, we have all been screwed over or mistreated at some point in our careers. Even then toxic person who gave you trouble. Yep, even the prominent folks in our profession who hold leadership positions in our state music associations. This is a business that deals with egos and human beings. We've all been stomped on, trust me.