I'm more afraid of Musk getting access to IRS information and using that information against people/intimidate/blackmail. Remember people are compelled to report all kinds of things on the understanding that 1. It won't be used against them and 2. Will be kept confidential. If Musk breaks that not only does he wield a powerful weapon against those he dislikes, but suddenly it could be argued 'the right to self incrimination' comes into play on taxes.