I don't see how those are similar to Zynga pulling out of Facebook and switching to "Zynga Live" which doesn't yet exist. Google didn't "pull out" of offering

I don't see how those are similar to Zynga pulling out of Facebook and switching to "Zynga Live" which doesn't yet exist. Google didn't "pull out" of offering their services through the established browsers when they released their own. They didn't stop offering Google apps on the iPhone when they released Android.