Re: Why do you think
Maybe not. 2017 saw a lot of this kind of scam and the sec has been catching up with them and they are getting jail sentences. El Reg has had a steady trickle of these articles.
There is nothing special about bitcoin that makes it better for a ponzi scheme, except in 2017 there was a lotta suckers out there. With bitcoin every transaction you do is traceable, you can't hide a penny.
I'm sure the sec has a limited capacity for follow up of these crims but they will all be got. Wall Street knows that, it has better was to shovel around ill gotten gains.