Underhanded? 1) It helps me, because I no longer have to write auth/auth and registration code. 2) It helps users, because they no longer have to create yet a

Underhanded? 1) It helps me, because I no longer have to write auth/auth and registration code. 2) It helps users, because they no longer have to create yet another account to access some random app. 3) Yes, it helps Google, because it promotes other Google Apps by creating more Google accounts. Seems like a pretty obvious strategy that works out well for all three parties.