* Linux has taken over the server world and is the biggest mobile OS (Android is modified Linux).
* MINIX 3 is likely the most widely used OS on x86/AMD64 processors since 2015. (It's inside Intel Management Engine ME11 so it should run in more system than than Windows, Linux, or macOS).
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Since that debate:
* Linux has taken over the server world and is the biggest mobile OS (Android is modified Linux).
* MINIX 3 is likely the most widely used OS on x86/AMD64 processors since 2015. (It's inside Intel Management Engine ME11 so it should run in more system than than Windows, Linux, or macOS).
MINIX is actually on a different processor, in Platform Controller Hub. And there are three things you need to know about it:
1. It runs with highest privilege, so it has access to the whole system but you can't access it.
2. Its always running, even when your device is switched off.
3. It has a web server, complete with its own MAC address. There is no discernible way of cutting off its access. (I could be wrong on this one.)
Edit: This is also this open letter[0] from Tanenbaum after he discovered MINIX was being used in Intel ME.
[0]https://www.cs.vu.nl/~ast/intel/