There are a couple things that got him in trouble. The first is that he is very wealthy. When you have that much money, more eyes are looking at you so cutting corners is less worth it. The second is that, if the information is accurate, he “owed” money and paid less. I don’t know if they would’ve caught him if he didn’t sell any of his bitcoin on a KYC exchange.

But of course they don’t like it because they want more people to pay taxes. And what happens in mandibles is clearly going to happen here. 

 The State likes the sovereign individual thesis as a boogeyman/foil - see Osama Bin Laden or Elon Musk

But it does not like it in actual practice