[air]

Proprietary codebase does not deprive original project from potential contributors. Gpl'd fork might

[eeZah7Ux]

On the contrary, closed products very often compete against open ones.

Potential contributors often never hear about the Open Source projects used behind their television, phone, routers, editors, games...

[Arizhel]

Heaven forbid that developers have a choice in what they contribute to!