Get the facts on fees, features, and expectations for the next few years.The ARK 21Shares Bitcoin ETF (ARKB 4.06%) is almost the same thing as owning Bitcoin (BTC -0.26%) directly. The exchange-traded fund (ETF) is a bit simpler to manage, since most stock-trading services can handle these funds. Crypto-trading functions are less common among traditional investing platforms.So the ARK 21Shares Bitcoin ETF will largely follow Bitcoin, wherever the oldest and largest cryptocurrency is going. But there are a c ...