We are free, in control of the software, if we can, in practice (hence not on
a tivoized device), run, copy, distribute, study, change and improve the
software. Any free software license gives us these freedoms.
Let us take a more extreme example: why would I refuse to use a permissively
licensed program? It gives me all the freedoms listed above. The
proprietary derivatives do not. But I do not use those.
Of course, you can run whatever software you want. Or not run, for that
matter. If you only accept GPLv3 software, you have far bigger problems than
finding a multimedia player: you cannot run it on any popular display server
(Wayland is distributed under the Expat license; X11 under the, well, X11
license) or on the Linux framebuffer (Linux is distributed under the terms of
the GPLv2 only, and DirectFB under the LGPLv2.2). Also, you cannot use Linux
drivers.
