Because it's Apple. When have you ever known them to use standard... well, standards?
Since when was FLAC "standard"? And if we look at various standards Apple uses:
AAC
.H264
USB
IEEE 802.11
Bluetooth
caldav
webdav
POSIX
X11
IEEE 1394
etc. etc. etc.
That's just for starters. Why do you think that Apple is hell-bent on not following standards? They follow standards where it makes sense to do so.
I still don't understand this I'm afraid. How can Android be ahead of iOS in smartphone OS, but iOS is 54% *ahead* of Android... In what comparison?
Because Android only runs on smartphones and handful of tablets that no-one wants, while iOS runs on smartphones, iPod touches and iPads. And it was only relatively recently when Android overtook iOS in smartphone-sales, installed-based is totally different thing altogether.