I can absolutely comment on the prevalence of this practice and the necessity of the legislation. Unfortunately, we don't have numbers about how many people went through CAMH because of how scarring and hurtful a process it was.
What I can say is that universally, every single trans person who is out and who is trying to seek gender-affirming care has already had an incredibly intense process of coming to terms with themselves. As part of this, they are always being confronted by people with these conversion therapy ideas, like autogynephilia and rapid-onset gender dysphoria, from critics and people who don't want them to transition. Again, these are practices in conversion therapies that come from Canada, that come from Toronto, that are practised in Toronto to this day.
What we do here changes the script. What we do here says these ideas are not credible and refuses to allow them to be perpetrated against trans people from coast to coast here in Canada and elsewhere in the world, period. This is no longer something that is acceptable in 2020, basically.