The IRS will make a claim against your wealth based the the information you give them (assuming you play honestly). Any money going out is subject to capital gains tax and any money going in subject to income tax. Transfers between wallets must be proven, and they always make mistakes in their favor. It's all about risk mitigation. If you are risk averse then maybe you don't care. If you don't mind sending all your crypto metadata to the IRS then maybe you don't care.  

 *if you are not risk averse then maybe you don't care