...it was fucking well SPELLED OUT, in the post two up from yours, BeeP, by Ben: They don't *only* distribute MySQL under the GPL. The alternative, if you want to do non-GPL-conformant things -- like, extending it with your own code, and NOT include the source to those extensions -- with their code, is to BUY A COMMERCIAL REDISTRIBUTION LICENSE from them. (As the copyright holders to the original MySQL code, they can do that.)
Now, if people get the impression you can do whateverthefuck you want with the freely downloadable version -- going "Hey, it's 'Open Source', right? Isn't that the same as 'Public Domain'?" -- then who the fuck would ever buy one of those commercial licenses?!?
That's so fucking *obviously* "irreparable harm" even in the financial sense, that the judge *must* be a moron for not seeing it.
And as for you, BeeP, not seeing it *even after* Ben spelled it out... Well, I'll give you the benefit of the doubt and assume you were tired or something.