Cheap enforcement isn't necessary because the government can create enough disincentive that most people will simply pay the tax. The whole point of the lack o

Cheap enforcement isn't necessary because the government can create enough disincentive that most people will simply pay the tax. The whole point of the lack of anonymity in Bitcoin is that the government CAN have an idea of how much money you owe in taxes and they can simply throw you in jail (or take your house, car, etc) until you pay. Yes, that's pretty expensive for the government, but they don't have to do it to everyone. Faced with those consequences, most people would just pay.