[bonesss]

I see it, somewhat cynically, as an advanced competitive strategy.

At some point something will become "the standard". Up to that point Google will have to be making huge investment in their own tooling to operate at their scale...

If "the standard" is someone elses, they're playing second fiddle in the big picture. If "the standard" is different than their own tooling they're paying a premium in dollars and a premium in talent-time to train new hires.

Giving away their tooling and supporting it to become a 'best of breed' solution outsources their training costs and 'onboarding' time to the greater industry. Facebook, MS, and VMWare are paying people to get good at Google tech and selling Googles tech in the Entprise. Their open source strategy also ensures, as you said, a 'level playing field'. A level playing field where they are guaranteed to not get locked out, and where where their size, strengths, and deep competencies of product and domain give them a massive competitive advantage.

It's smart on a lot of levels.