But they don't answer the question of how Chrome makes sense as a business proposition for Google. Taking on responsibility for an operating system is a heavy duty obligation. Contrary to myth, Linux is not maintained by a bunch of hobbyists; it is a high class, thoroughly professional operation supported by major providers of hardware and services that benefit from having a cooperative effort on an operating system and that make money by selling the complements of hardware and services.
The benefits to Google of maintaining Chrome are more indirect -- the idea is that, somehow, the OS will translate into more eyeballs for Google's search business. But no necessary relationship exists between the value of those eyeballs to advertisers and Google's costs of maintaining Chrome. So unless Google intends to go into a new business of selling aps that ride in Chrome, the move seems high risk. As eWeek notes, failure would be damaging to Google's reputation, not least because it would irritate geeks who spend time on Chrome.