a) Site is down, google cache is here http://webcache.googleusercontent.com/search?q=cache:NBcmXVo...
b) The license file on GitHub does not mention GPL, a time frame or something even remotely related to the post - looks like some sort of shareware license.
c) If it's a good product today, will it still be a good product in 3 years? In today's version? I doubt it.
Still better than just selling binaries, but not by much.