Google's core business is providing web services and putting ads on them. That core business means Google focuses a lot on running those web services effectivel

Google's core business is providing web services and putting ads on them. That core business means Google focuses a lot on running those web services effectively, which is why they are now focusing hard on the business angle of running other people's web services. Google spends $2+B per quarter on capital expenditures; where do you think that money is going if not datacenters? Using Facebook as a default login was never core to Parse (e.g. PFUser: https://parse.com/docs/osx/api/Classes/PFUser.html https://parse.com/docs/osx/api/Classes/PFUser.html) nor is Parse nearly on the same scale as Google's investment in its datacenters / web software efficiency.