Comment by ColanR

>> If you submit code, you grant a license to Google to use it in non-proprietary [sic, I assume] code.

> it's a copyright license, not a copyright assignment

>> So, at some point, once users and developers are locked in, Google can make later versions closed and proprietary enough to stop clones.

> you're welcome to fork it if you wish, or distribute proprietary, non-open-source versions of the code

It sounds like you're agreeing completely with everything the parent said.