Yeah I just did some Googling and two law sites and the Registered Massage Therapists Association of Ontario site and all three say RMTs get delisted for fraudulent billing practices and POSSIBLY if the RMT has been disciplined for conduct by the RMT association. So if they are charging the insurance company for the whole cost or billing when no services were rendered, then the insurance company cares. The insurance companies don't give a flying fuck if they are giving out hand whammies, as long as they don't bill the insurer for them.
If an RMT was reported to the Association for conducting sexual services and found guilty and disciplined, then insurance companies could possibly de-list them. The Association doesn't actively investigate though, someone would have to submit a complaint and then it would have to be proven/defended. THEN the insurance companies would have to decide if that is something they would want to de-list someone for. There is also a CBC article from a couple years ago on the topic.
So if your RMT gets de-listed, it probably isn't because you wrote a steamy penthouse letter on Massage Planet. It is much more likely that they were engaged in some sort of fraudulent activity.