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At last count there are 5 major operating systems with >100M users, how many are required in order for there to be "competition"?

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Windows Linux Android based on Linux macOS (based on FreeBSD) iOS also based on BSD

So, mostly three. Especially considering the BSDs' wide server presence.

Darwin is much further from BSD than Android is from mainline Linux, and the Android/Linux distinction is entirely sufficient to call them different operating systems.

I think you can accurately say that there are either two or five distinct operating systems in wide consumer use at the moment: Windows and Unix, or Windows, macOS, iOS, Android and Linux.

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