I honestly do not care if people use a proprietary closed-source operating system, but it freaks me out on an existential level that important things that might

I honestly do not care if people use a proprietary closed-source operating system, but it freaks me out on an existential level that important things that might kill you are closed source. Life support machines, x-ray machines, heart-rate monitoring machines, even voting machines. Nobody knows what's going on in there, and a software fault or hack could be the end of you. Like that Toyota "unintended acceleration" bug which would've been discovered a lot sooner had other people been looking at the code. This is also coupled with the fact that these vendors, for reasons that challenge the absolute limits of my comprehension, insist on using old versions of Windows. I would not be surprised if equipment of that sort sold today still runs unpatched versions Windows XP. ATMs and cash-registers are likewise a total farce. Some of them are packaged so poorly it should be criminal.