“The crucial point is that purpose of Bitcoin is to allow people to conduct transactions among themselves without a supervising institution such as a bank...”
Every time I see that thought I think, “no government will ever allow that to remain established”.
The IRS already added a question about ownership of cryptocurrency to the 2020 tax forms. You know what can happen if you get caught lying to the IRS.
Those supervising institutions (banks, brokerages) file info withe the IRS so they know who should be reporting certain types of income. No way in 1 million years governments are going to do away with that critical info.