"It's not going to stop any breaches, but it reduces your risk, " says Raul Vargas, fraud operations manager for Identity Theft 911, an identity-management solutions firm.

WSJ: Don't Let Tax Cheaters Target You

"It's disappointing from a branding and local identity point of view" to see the BSX close, said Kevin Martin, general manager of Bendigo-based broker Strategem Investment Services.

WSJ: The End of the Line for Famed Exchange

As for Banksy's true identity, he could be a homeless guy who gives away all his earnings or he could be a hedge fund manager, Rushmore said.

CNN: Banksy: Still hiding in plain sight