Most of it is just lack of knowledge imo. Every new technology has its haters. If you look back a few years ago, many many bankers were saying it was a scam and a ponzi or whatever, but now they are all investing their hedge funds into crypto and have held back criticism after buying in. Honestly seems to me like they are talking down about crypto just to lower the price to get better buy ins. In the end, rich people love making more money, and crypto is just one more way to do that, so why would they avoid it unless they just don't understand that yet.