Opponents to cryptocurrency are a very vocal "think of the children" minority as far as I can tell. In the US there seems to be broad interest mostly gated by technical difficulties.
As noted many times here, anonymous crypto is only as bad as cash.
I think his point is: Bitcoin explicitly takes a libertarian position to taxation by making it hard to tax. While most crypto adopters may be libertarian, the majority of people are not and so the libertarian position will deter adoption.