Its because the rightsholders instead of treating copyright to advance the arts and sciences and acknowledging that fair use exists, instead use it to nurf creativity under guise of drowning you in a hypotheitical neuanced multi year litigation that will cost millions, if you feel your use is within your right.

People are now upset because since that was the status quoe for so long it got people to believe that they if they made a song, and all they saw was copyright, and copyright sues for everything and wins, and someone heard that song in the background while inventing a microwave they are entitled to all the microwaves earnings, and before if you said no thats absurd, you had to spend millions to see if the system didnt fail you.

And now people are spending millions to prove that it is absurd, and everyone is up in arms that someome called their bluff with resources.