Well okay, you've found one counterexample. In the most compulsive record-keeping society in the classical world.
And I hate to mention this, but SPQR is not a true acronym because it can't be pronounced as a word. It's an abbreviation. Today laymen use the terms "acronym" and "abbreviation" interchangeably, but linguists and other scholars do not.
Radar, Cobol, laser... these are true acronyms. So is Taser: Thomas A. Swift Electric Rifle.
And of course in Hungary, USA is an acronym, because they read it as OO-sha.
That was an amazing riposte good sir.