It's different in bitcoin as it is decentralized and it can never be corrupted by government, it's either they adopt or they will hate bitcoin by banning it.
Income tax is not supposed to be evaded even if you are using bitcoins! Income tax is tax on your income. Hence if you do earn from bitcoin, no matter where you are you should be paying income tax. The concept is quite easy. You earn, you pay for income tax. Even if your source of revenue is from illegal activities you have to pay for income tax. The government will realize you are not paying income tax the moment you overspend outside of your means. For example, a big corporation acquired a multimillion dollar servers without even declaring a single cent to the government. That would be investigated outright.