I think the problem is that a powerful entity is profiting off of other people's work without their consent and gives nothing to the exploited members in return. Sure, an individual human learns from copyrighted works and reincorporates to make something slightly new all the time. And then they may also profit from it and not give anything in return to those that came before.

The problem here is the scale and the power that enables that scale. This is industrial level mining of non-consenting humans, exploiting their life's work in many cases.