The first thing you have to realize is that all governments, not just your own, are after one thing only, revenue. Some of them have scruples, but more often than not governments simply do not care what pretense they use to get their clammy hands on your cash.
As a means to this end, many governments around the world have gone to great lengths to eliminate any and all banking privacy that you may have been able to enjoy at one time. Although a cashless society may be the ultimate dream of bureaucrats, for the moment they make do by implementing ever more restrictive legislation. Most of this legislation is ushered in under the guise of the so-called “war on drugs”.