Re: Software relicensing, how is it done ?

["Richard M. Stallman" <rms gnu org>]

    In this context, what Hub is getting at is that if a free software
    project becomes beholden to a proprietary tool (be it an IDE, a
    debugger, a compiler or a source control system), it's an unhealthy
    situation in the long term. There are substantial risks involved.

Not to metion the fact that merely using the non-free program
sends the message that non-free software is ok.  Thus, it was a good
thing when BitKeeper ceased to be available gratis for development of
free programs such as Linux, because that meant Linux could no longer
encourage people to use BitKeeper.

See http://www.gnu.org/philosophy/mcvoy.html.