Bought or invested in? Bitpay was shooting themselves in the foot by not branching out into other digital assets while fees and transaction time skyrocketed. If it took Bitmain to force the issue congrats to them.
The chinese government wanted a crypto they could track, because they want to own all of the mining infrastructure, all of the nodes, all of the code base and the payment gateway to it. So that's what they got. Bcash.
Who mines a block or where the nodes are etc is irrelevant, the ledger is open and public for both Bitcoin and Bitcoin Cash. This isn't the place for wild anti-Chinese conspiracy theories.