This. Lesson learned: the "over 150 developers" who literally threw away their time(i.e. money) working on this had the option to work on minetest instead. They didn't. Grow up, learn your lesson (I have in much more painful ways) and only use GPL.
It looks like the lesson from Bukkit is that if you use GPL and there's some problem, then a disgruntlend copyright holder (of GPL-licensed code) can get your entire project into trouble.
The project of course was wrong to include or link to proprietary code. But had they used a free license for their own stuff, Wolfe wouldn't have had a claim to make.
It gave a developer the power to take down a project violating the GPL. That's probably a quite good power for them to have. I don't see how that's a problem for anyone except if you currently are or wish you could violate the terms of the GPL.