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yes, only 15 million...
What exactly does active users mean? Can you please point me again to the source of that chart? (EDIT... nvm, found it: here) Steam apparently claims 25 million active accounts. That doesn't mean 25 million people use Steam on a regular basis. I'm pretty sure WoW does a similar thing (counting inactive accounts as WoW players) but it's been a while since I've looked at their stats.
EDIT
Now that I found the source...
It's according to Phil Schiller. Is there any independent source who can confirm the accuracy of the claims? Do Apple publicly publish those sorts of stats somewhere other than as headlines for big events? I haven't yet seen anyone else claim anywhere near 75 million users who isn't referring to that particular source.
If I learnt anything from Al Gore's colourful film, it's that pretty charts don't mean much by themselves.