Earlier quoted context omitted.
And unlike many other services, the network effect is quite low because I can easily install multiple video conferencing software or even run some in the browser. If someone organising a meeting asks to use something unusual, I'm normally not that bothered.
My wife sees doctors at four different clinics. Each has chosen a different remote meeting solution. It's non-negotiable - to see your doctor remotely, you need to use their software. And that's just in one field. I'm not concerned about Zoom monopoly at all.
Mostly they were using a 3rd party solution like webx/zoom/etc but one doctor (automated in an online form) noticed his number was tied to iMessage and offered to just FaceTime him at his appointment time. Super easy for him (at 94) to self-manage vs any other solution where we (my mother or myself) need to be around to set things up for him.
Not sure how they are doing this exactly, if this is something Apple specifically enabled for healthcare or whatever, but its a fantastic experience.
Whatever solution they were using did have an "no I have an android and a 'use my computer' option" not sure what path they led down.