Jfc this community
Don’t use anything ever, at all, if that’s your take. Almost every business, industry, and sector users windows in some capacity. You cannot avoid it. Your bank uses windows, your local government uses windows, fucking Taco Bell uses windows.
What would you prefer, every company use individual home grown, poorly maintained software?
Every company use only Linux? That’ll create so many more problems.
Go live in a cabin in the woods if you’re this paranoid. Otherwise bank on the fact that regulations surrounding healthcare data are pretty strong and are taken pretty seriously, and Microsoft knows that.