He would have to pay some taxes, he can't evade everything. But yes, there are people who do that. Start a business and convert the money. Better not to mix it with Bitcoins. U can do that after converting it, but if you mix with Bitcoin and then try to convert, it will look fishy to the government.
Well as of now there is no tax in bitcoin! well i think start a business but with the help of bitcoin. I think i know your point if you convert or something get profit in your business with mix of bitcoin then you gain a ton of profit and convert it into money then the government will notice and it will cause something about money laundering
Bitcoin is always suspicious for any government and even for people who will later know you are using it. The people around us heard about bitcoin on TV and they already learned about it being used by criminals, blame the media for it but that's the truth. A lot of criminals and they said terrorist use btc. In order to avoid suspicions just be discreet.
BTC worth 100K USD can already raise a red flag, even less than that.