Some markets. All kinds of financial transactions are happening as we speak in various DeFi ecosystems on a permissionless basis - you don't need an account, just a wallet.
Before say "your wallet is your account", only sort of. You can have any number of wallets through any number of applications that support it, including rolling your own if you so chose. Certainly nothing like the KYC/AML required of, say, Robinhood.