What’s next? Gee, idunno. Ban crack and fentanyl? Taxes and warning labels on cigarettes and alcohol? Oops, already happened, and the world didn’t end. The state (in the broad sense) has always banned this thing and made that thing difficult. If you want absolute freedom, you’ll never find it, because you need anarchy for that, and true anarchy doesn’t exist.
Under the proposed ban, you can still perform CT on a consenting adult if you only advertise by word of mouth and do it for free. Yes, that will have a chilling effect. Yes, it’s intentional (like taxes on cigarettes and alcohol).
Perhaps something like psychotherapy for a teen who is confused about their gender identity because it is argued that gender dysphoria cannot be a mental disorder?