> There's no copyright license or free (as in speech) indication shown for the apps
Any app can add in its description what license it has. There doesn't seem to be a special field for it though, that's true, not sure if intentional or a temporary limitation. But the app store is not meant just for open source apps but for all web content that uses open standards.
I wouldn't say that's distancing from the open source community. The fact is, if you want a YouTube app, a Twitter app, a Facebook app, and so forth, none of those are open source, but they are the natural first apps for something like this.
The app store isn't like the addons site or say the mozilla demo studio