I think this was your point but yea, I'd be more concerned that access to your doctor is contingent upon installing a specific proprietary software and accepting that software's terms of use. That's like a doctor saying you can only visit them if you drive there in a Chevrolet.

I can call my doctor using any phone I like, and E-mail her using any E-mail client I like. It is beyond unreasonable to require a patient to install specific client software in order to access care.