I'd say it's because there are different milestones that people - fanboys, media, companies - set. There's so many ways to measure. Daily activations, current t

I'd say it's because there are different milestones that people - fanboys, media, companies - set. There's so many ways to measure. Daily activations, current total market penetration... then there are variables like location (US or global?), range (smartphones or all mobile devices?)... Android is just winning them one by one, and this specific one happens to be one of the most important metrics, IMO.