Did it used to GPL then?
Because I always though once something is GPL it's always GPL.
You misunderstand. It was never under the GPL, but the author
had made the sources available for peer review. Don't be a Stallmanite and assume that one means the other.
At any rate, they could get away with it by making "a significant improvement" on the old sources and closing their "addition." It's all very unstable ground, precedent-wise, nevermind the fact that they just so happen to own the
only authorised source server.