Trader makes 14 million in 1 day on this private decentral exchange dYdX

How is this possible on this private decentralized crypto exchange dYdX out of Switzerland. It just had over 4 billion in 24 hour which is half of Coinbase. They also take USA residents

https://help.dydx.exchange/en/articles/4798063-location-restrictions

dYdX’s growth may have changed DEXs, but can it sustain itself

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