This is how ASICs make networks more secure (from huobi.pro):
Announcement on the Suspension of BTG deposits
Dear users,
Due to blockchain network instability of BTG,Huobi Pro has suspended BTG deposits. We apologize for the incovenience that this may cause. Thank you for your understanding.
Huobi Pro
May 19, 2018

Note that we can expect this same attack to cause problems on all equihash chains now, especially BTG, Zen, ZClassic, Bitcoin Private, Komodo, & Hush. All of the smaller cap coins are at risk of being devastated... and again, even zec might be at risk, though the chances of bitmain biting off the hand that feeds is less than them attacking the smaller cap coins