Let's see what their actual association with it is. There's no details in there. I wonder why it would be anything beyond selling them hardware in which case there's nothing to answer for.
It's not that I have much sympathy for Bitmain, but getting into legal troubles for merely selling mining equipment to the wrong company does seem a bit excessive. Maybe it's just a way of "playing it safe" and covering all their legal bases?
They didn't just sell
There is an interesting topic about bitclub going down
herePeople from bitmain were meeting with the operators of bitclub, and another familiar face also
, and main knew all the time how much gear they've sold to them and how their claims of buying millions in equipment were fake but never denied them, they've kept quiet.
And of course, there is also the possibility of bitmain actually helping them with a bit of hash rate to fake the stats, wouldn't be surprising