Come-on get a grip, there are plenty of examples were free software abiding software projects have used closed source software, a prime example is Linux, on Linux you can choose to use closed sourced drivers or open-source drivers, the proprietary drivers deliver better performance and reliability. Drivers are not the only example ; you have browser plugins on Linux like Flash, you have open-sourced equivalents like Gnash, but they are not up to par, Firefox implemented this so that it doesn’t get left behind in standard compliance, it’s not the end of the world if you used closed sourced software, VLC player another prime example has support for proprietary codecs and standards, otherwise what use would VLC be if it can’t play WMWs or AVIs (not to say now that these formats are the only ones which are used)
