[comatose]

well, safari, chrome, osx, iphone, iPad, amazon, android, appletv, and a large number of routers and car systems all use gpl under that license singly. the fact that it's mostly due to linux and khtml seem unimportant when you say so much gpl is dual licensed ( all of those contain software that is gpl only) but, yes, dual licensing is popular too, ie the immense popularity of qt

[racer-v]

Eh, what? Safari and Chrome are not GPL - they're Apple / Google freeware built on BSD and LGPL. OSX is proprietary based on BSD. Android is notable for refusing to include GPL components other than Linux. Not sure what you're trying to say here.