, but recognize the ongoing dilution of US currency by (currently) 83 billion dollars a month
And yet you do not recognize this as the feature that it is.
http://www.usinflationcalculator.com/inflation/current-inflation-rates/
Despite the (virtual) printing of ~83 billion dollars a month the dollar is not magically dropping. Liquidity trap and all that. The ability to print more money as needed is a *feature* of the system. Any currency where you cannot do this is seriously lacking in long term sustainability and is essentially only a pyramid scheme for early 'investors' and currency manipulators.
People have a million and one reason to use an anonymous non-nationally-controlled currency
Sure, move the ability to manipulate to an unregulated self interest rather than a fiscal and monetary based system balanced by elected officials and shareholders. Brilliant.
But yes, there are millions of reasons to use a currency other than your own governments, and mostly that boils down to various iterations on 1: business in that country. 2: to avoid tax. 3: to evade tax or 4: illegal sale of goods.
I recognize that today's donations to a group of brave "freedom fighters" (c.1980, Taliban-vs-Soviets) becomes tomorrow's financial support for a "terrorist organization" (c.Now, half the planet including PETA).
This doesn't really change anything. Paying taxes to the US government while it was invading Iraq and torturing people was supporting terrorism too. Whether you had to pay in bars of gold, gold certificates, a fiat currency or something else you still had to pay it. Whether you have a bitcoin being donated or a slab of US dollars you anonymity is not impacted particularly. You only know who controls the value of one of those though.