It all comes down to concentration of the industry. Open standards thrive when one company isn't able to just roll their own stack from the hardware all the way up to the applications; in-housing and locking-down thrive when one company is big enough to just do everything itself.

When Google was small it embraced an open OS, the open web, email, RSS, etc. Now it's big enough that it doesn't need (and therefore doesn't want) open technologies.