This is ridiculous  Many governments for years have had indirect ways to trace your income whether you declare it or not. So, in this way I don’t really see a big difference between good old cash that is traditionally used in the ‘shadow economy’/ ‘black market.’ Whenever a person tries to evade payment of taxes, s/he will easily succeed in it. At least for some time But then the IRS and other authorities come into play. Remember Al Capone? Had he used btc, I believe the result would have been the same So, not to worry, btc just cannot “create a hole in the cycle of economy.”