Personally I think this says it all about this site.

12. Force Majeure
12.1. Bitmain Affiliates is exempted from fulfilling its obligations under this Agreement and is entitled to cancel the Purchaser confirmed orders without any liability, in the event of force majeure such as strikes, floods and fires, wars, riots, interruptions in transport, shortage of material or energy sources affecting Bitmain Affiliates or its sub-suppliers, accidents or other occurrences which affects sub-suppliers production, bankruptcy or compulsory liquidation of a sub-supplier, accidents of any kind, governmental decisions which affects manufacturing or use of the Products and, in general, such events that were unforeseen at the time of the order which prevents or hinder manufacturing, transportation or delivery of the Products to the Purchaser.

Taken from the website itself in the terms and conditions.
This gives them any excuse they desire to cancel your order and not return your funds.