I think that placing it in github or something like it would suggest a continued involvement or a state of maintenance. This is a 'fire and forget' way of open sourcing something.

Takes 10 seconds and the effect is much the same, you get the source, what else could you ask for ? Nicer wrapping paper ?

My guess: it was easier.

Hey, you're in luck: http://github.com/nikodemus/raylisp