Wash trading is not just one thing, I give you that. But a frequent way of achieving wash trading is to buy and sell from yourself via multiple accounts. KYC/AM

Wash trading is not just one thing, I give you that. But a frequent way of achieving wash trading is to buy and sell from yourself via multiple accounts. KYC/AML + Terms of Conditions specifying you can only own one account prevents that, as much as it can at least. Even if you are two different people just trading between you, AML laws will prevent that and surely Coinbase has the most basic checks in place to detect something that simple.