Oh, its not a mystery at all. Its just odd to come across people (in general, not you) who still think an advertising company would care all that much about their users (who are not their customers anyway). But yes, they're quite far from being the worst in this aspect.
They can care for selfish reasons. If android is completely riddled with bugs and is constantly compromised users will use a different phone system. Even outside security issues being able to roll out new features to people keep them from switching to iOS or Windows Phones.
Well I'm guilty of that same conception too. Why are the two at odds? Google wants to own the best platform for users out there. Engineers want to work on the best, app developers want to work on the best, and users want to use the best they can afford.
