Can you explain to me the mechanics of how purchasing an NFT facilitates money laundering? You'd have to buy $23m of ETH with cash, which isn't as easy as it s

Can you explain to me the mechanics of how purchasing an NFT facilitates money laundering? You'd have to buy $23m of ETH with cash, which isn't as easy as it seems, but then why is the NFT important? Just put the ETH through a tumbler and sell it. Withdraw to a bank account and tell the IRS you made a lucky investment.