Everyone has his/her dislikes you can't force someone into something he/she doesn't like is just simple.
Many of this millionaires feel they already have a lot of money and they envy many of this crypto investors deep down they alswmo want to have this freedom and invest but pride and shame won't let them so they put all effort to tag crypto as illegal currency or make a bad name for it even move to the extend of demanding ban for cryptocurrency. Many of this people wish to be like use