Depends on the definition of success, I suppose. For Google I think success is either having a substantial percentage of the world's population using it, or for

Depends on the definition of success, I suppose. For Google I think success is either having a substantial percentage of the world's population using it, or for it to be making a huge amount of money, with that amount being compared to Adwords. The closest they've come is almost certainly the new Google Photos app, which will probably end up with a decent portion of Android users actively using it.