It's a public ledger, it's the worst way to make something illegal, many drug dealers found it out too late. Just an example even if a person doesn't use an ad

It's a public ledger, it's the worst way to make something illegal, many drug dealers found it out too late. Just an example even if a person doesn't use an address, if a Russian person checks out a HD multisig public key from which other keys may be derived, the sender can get suspicious.