So if I understood it correctly, bitmain has a remote kill-switch (effectively, since they can brick the machines with the firmware change) on 70% of hashrate? fanastic. What are we supposed to do now, other than change the PoW algo immediately?
It looks like it can be blocked with a change of code. And it also looks like it's an old feature named Minerlink that was never put into action but left there to fester. That's giving the benefit of the doubt of course. Regardless, leaving a gaping hole like that isn't doing anyone any favours.