Another user contacted me after he noticed that the thread was removed, and also my new thread asking about that thread that disappeared. Bricsys is not creating good feelings with what they are doing. At least be open about it, and let the users know when a thread is removed, and why. Otherwise, it starts to feel there is a secret censorship group, that has secret rules about what gets removed, and you are just left guessing about what is permitted and what is not.
I think most users respect Bricsys' right to control content on their forum. But, being secretive about it is not what users expect.