[ap3]

What about linux? depends on what you mean by losing.

then with the qualifier 'that does not restrict users and developers', what restrictions would suffice to push users and developers out vs. the incentives that drew them in in the first place.

open for openness sake is not enough - it's just one more variable in the ecosystem equation. A couple of examples: as a user I do want developers to be restricted from putting malware on my device. And as a dev I would want users restricted from going against the TOS of my app.