This saying / idea sprang out of folks losing content they "bought" via online platforms.
Basically the letter from Sony(?) Said that due to licensing rights content was going to be removed from their servers.. and that the items you bought were no longer available.
So.. essentially nothing on a digital platform is ever purchased . It's just leased until the platform owners decide to alter the deal. And such, if you can't actually buy it... Are you actually pirating it?