The issue with the WTP argument is that Netflix isn't a singular good - there are many replacement goods (Hulu, Disney+, Prime Video) that push down the price via competition. The lack of raw materials makes this competition especially good at keeping prices low.

Now, if the oligopoly within video services (or anywhere else) would conspire to raise prices together - that'd be a different story. We've seen this in other digital goods. The Apple and Google anti-poaching agreements come to mind.