[5e92cb50239222b]

  > And why does it matter that it's not open source?

I honestly find this question really weird. Do we really have to explain such basic things nowadays? It may not be important to you, it is extremely important to me, and (apparently) xyproto.

[fxtentacle]

And that's why you're not using Windows, Mac, Android, or iOS, but only Linux, correct?

Mostly people want open source but they'll happily abandon it for convenience. That's how Gmail won over Dovecot.

[esrh]

That's exactly why, free/open source enthusiasts are just the minority type to prefer freedom or privacy over convenience.