Are you really this uninformed, or do you just like to make things up when the facts don't go your way?

ALAC was created for the purpose of streaming audio between Apple devices. I believe it was first used to stream audio to an AirPort Express (which has audio output, so you can plug a speaker into it and stream music from iTunes to that speaker). I assume it's still used for that purpose, but it's also used for the more general category of streaming audio over AirPlay. Given that, I would wager that ALAC is used many orders of magnitude more than FLAC is, even if it's not directly exposed to the end user.