It's a rational response to the extreme social, political, financial and potentially criminal risks associated with profiting off content that may be identified as child pornography or sexual assault.

The Traci Lords case is a good illustration of this. One day everything is order, the next somebody realizes she used a fake ID and bam, everybody involved is suddenly manufacturing/profiting off/in possession of child pornography. Add in the massively lowered bar for OnlyFans/PornHub, where anybody with a phone can now DIY, and it's a legal minefield.