Sometimes doing one thing well is good enough. Like Gillette or Coca-Cola.

Gillette is part of Proctor and Gamble. Coca-Cola makes hundreds (thousands?) of products.

I think Google also thinks this would be great, but they haven't figured out how to do it yet. Hence the many bets on new technology.

Enterprise (with Google Docs), and maybe Chromecast, are the two arguably profitable non-advertising products. The other product areas are surely in the red.

Google is trying to diversify, but they haven't been successful at turning a profit on non-advertising products, at least not yet.

How can you possibly know (unless you're a member of Google leadership team)?

Because they're a public company and are therefore required by the SEC to provide a certain level of disclosure about the sources of their revenue.

I understand that, but it's not what I meant. I meant is how he knew that other products such as Play store are not profitable? I don't think Google breaks down the profit reports to this level of granularity, so it might be just reported as an ad revenue/profits.