IIRC he ruled last time that it didn't undergo the proper public notice and comment period originally. They basically drafted up the same regulations, put it through the public notice and comment period, didn't change anything based on public comments and now he struck it because it was exactly the same regulations as before.

I mined a few back in the day. I think I got a couple pizzas and a new router out of it. Could've bought a decent house at the peak value. Oh well.