You can tumble it, but Bitcoin is not private by default. It might provide opt-in privacy if you go out of your way to use mixing services.

> It is the most anonymous digital currency after cash cards.

Monero is far, far more private. There is a reason why most reputable cryptocurrency exchanges don't accept it and it's because of its privacy features.

These make it impossible to trace your transaction history (and comply with regulations), which is quite trivial to do with Bitcoin.