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Open source? Hmmm MacOs? Android?
Android is just boneless Linux, thus it's being the most successful open source operating system. I guess the number of Android devices outnumber all the Macs.
You realize that Linux is not Open Source. The open source parts of Android are mostly of the google ones (AOSP).
FreeBSD is an Open Source OS.
You realize that Linux is not Open Source.
Huh?
How is macOS open source? It’s not just Darwin you know. Some might even argue it’s an abuse of the BSD licenses.
macOS uses the lack of defense that BSD provides (for Darwin). That's what Open Source licences are.
There are more examples of Open Source project:
MINIX 3 -> Derives into one of the worst pieces of malware ever. The Intel Management Engine.
There is no such Open Source licence infringement. Open Source licences like BSD clause 3 are permissive in every aspect (well maybe not in TM part). They are so open that they allow restricting the freedom of the software.
Linus Torvalds already stated (LinuxCon 2016):
Over the years I've become convinced that the BSD license is great for code you don't care about. I'll use it myself. If there’s a library routine that I just want to say 'hey, this is useful to anybody and I’m not going to maintain this,' I’ll put it under the BSD license.
Referring to Free (libre) Software as Open Source is a disqualification of those projects and their philosophy.