But that's the Android Alpha and Beta builds, so that means Android exists on 2006-2007 but it gets public in 2008 and it's market adoption increases in 2010. I had my first Android in 2013
Android had an API but they were pre-releases, so this means this was early versions of Android non-public, so they were exclusive for some developers or some people, I guess.
because android 0.9 is not an android version, the first android version is 1.0 but that is not an comercial android the first comercial android os was 1.5