Was sind die Vorteile von Bitcoin-ETF?

Could you elaborate on the benefits of investing in Bitcoin Exchange-Traded Funds (ETFs)? As a cryptocurrency and finance professional, I'm curious to understand the advantages they offer to investors. Does a Bitcoin ETF provide access to Bitcoin's returns without the need to directly own the underlying asset? Does it offer diversification benefits within a portfolio? Are there any regulatory or tax advantages? Furthermore, how do they compare to directly investing in Bitcoin, and what are the potential risks associated with investing in a Bitcoin ETF?