“My guess this is being done on the advice of lawyers.”
Probably.
My wife is a doctor and fires patients who won’t follow her advice. They always cause trouble and end up sick and blaming the doctor.
My father got fired by his doctor after his doctor refused to fill his prescription for gout medication saying that my father did not have gout. This was despite the fact that his previous doctor, from whom he had bought the practice, had diagnosed my father's gout years before and had prescribed medication to treat it for years up till his retirement. The doctor was a West Pointer and former Army doctor and wasn't accustomed to having a patient challenge him.
I find professionals that have the notion of firing customers/clients/patrons to be quaint. It is as if they have no control in their lives and have to adopt the obamaeque delusion of word twisting.
Just say you refused them as a customer/client/patient/patron it is much less taxing on the conscience.
Doctors don’t have a problem with clients who smoke/overeat/underexcercise/don’t flu vaccinate.