Yes, Bitcoin was created as a currency, but many markets have opened the doors for Bitcoin. The crypto infrastructure is still forming and people are trying out different fields that Bitcoin can affect. One of those field is ETF. It's not necessarily the best thing to happen to Bitcoin, but it's something that people think should be tried. You can't deny that Bitcoin ETFs have big demand. It's different if Bitcoin needs ETF or not (I think it doesn't need ETF to be great, but it's something that will probably happen).