I have to admit to being on both sides of the fence with this issue. On side 1 people should have the freedom to choose whatever therapy they deem potentially useful, and the libertarian in me says people should be able to espouse whatever ideas they choose.
On the other side side, there is the evidence that conversion therapy doesn't work. It holds out hope that people can be "converted" back to heterosexual orientation or a heteronormative gender identity. There are probably a few cases where those who wanted to change may have been helped and for those who wish to change, perhaps this should be an option, rather than legislating it out of existence. I can't speak of all the therapists but the ones my wife made me go to HAD to be Christian Counselors and the only advice they offered was to accept Jesus and Lord and Savior, make him Lord of your life, and pray, pray,
pray.My understanding is that other therapists can be more interventional and demeaning. After all, I am/was a Christian and don't tell me that I'm not because I believe I am transgender.
One of the main proponents of the Es-trans movement is Jerry Leach, who had no training in counseling but used his own experience to tout that people can be changed. Wives faced with the fear of losing their husbands often cling to the hope held out by these people, rather than allowing their spouses to get the help they need in coping with their gender dysphoria, again resulting in depression which could lead to suicide. Other former proponents of Ex-gay therapy such as Alan Chambers, former head of Exodus International and if you do a search on Ex-gay movements leaders denouncing reparitive therapy on the internet, you'll find quite a few opposed to the therapy. even Russell Moore, head of the Southern Baptists has renounced reparitive therapy as counter-productive.
So yes, I believe that there are those who WANT to change that MAY be helped, but holding out the promise that conversion therapy WILL work, is a fraudulent claim, and that charging for the services which in all likely hood will not work is wrong. The question is how to balance free speech with the charging for something that probably won't work.
Frankly, I don't know.