In my opinion, KYC requirements in regulated gambling sites can be viewed from a security perspective. When we gamble on a site that is regulated, it often means the operators need to adhere to certain security and transparency standards. These standards include verifying the identities of their users to prevent fraudulent activities.

Now, let's consider the scenario where a site is not regulated, and users are anonymous. If, unfortunately, there's an inside job, and the regulators find out that the owners stole users' funds, there could be serious consequences. In such cases, the regulators might investigate and, if necessary, shut down the casino. They would then work to distribute any remaining balances to the users.

However, the distribution of funds will likely involve a legal process. It's highly improbable that these funds would be sent to unknown accounts. Regulators would typically have reporting obligations and a proper framework for returning the funds to their rightful owners. But, as you rightly pointed out, the risk lies in unregulated platforms. If they are seized by authorities, the process could be less transparent and the funds might end up in government treasuries as unclaimed funds.