The Amendment itself might be actually relatively harmless if Disney, RIAA, and Microsoft does not act like bullies by suing Daycares and Community Parks for "Illegitimate use of Copyrighted Characters" as well as the
2000s rows of lawsuits against people who "illegally" downloaded or shared music over the internet, and Microsoft creating the infamous "Legit_Access" Virus who basically locking down all internet-linked computer who operate on "pirated" copy of Windows. Which unfortunately also meant many third world nation governments suddenly found themselves locked out of their own computer systems.
The ridiculous lawsuits and bullying behaviors caused massive protests across the World in 2003-2004, before every corporation and artist who backed them ending up facing not only DELIBERATE illegal copying and sharing of their intellectual properties (with Microsoft ended up literally banned on many countries as they moved to Linux), their sales also naturally plummeted to record low.
The real death kneel of the Hyper-capitalist corporations, however, was started by Swedish Court's decision to backing up, and actually, promote "The Pirate Bay" as a measure against American Capitalism, Russia hosting Napster servers, and India openly launched "Quit Microsoft" initiative, who ended up erasing Microsoft's Asian Market virtually overnight. The ensuing "Copyright Depression" crisis of 2004-2010 also destroying much of any attempt to enforce copyright laws during the internet age, and as such, Sonny-Bono Amendment was seen as 'The Second Prohibition' by their detractors.
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Without the ill-fated Perpetual Copyright Amendment, I would bet we'll still use Windows OS on our Computer, and maybe someone could make paid download actually works...