Like people who own tons of Bitcoin or crypto but bought them without KYC? Either before KYC was a thing, or bought them through methods that did not involve KYC?
And how many people do you think hold a lot of wealth, who did buy with KYC, but anonymized them for privacy. Not for committing crime, but just mixed or XMR converted their btc and back to get anonymous bitcoin and are whales. Moving markets but no one, not even the US government, knows who they are?
Most of the whales and/or people possessing big quantities of bitcoins are anonymous. We can find the address containing most bitcoin and this data is publicly available but do we know who is the owner behind these wallets? No.
KYC is required only by the centralized wallets while the majority of the crypto is stored in decentralized wallets.