I disagree with the author that subscriptions are objectively and inherently the superior model for web monetization. An unsung virtue of the ad-driven web it's is inclusiveness and strong worldwide redistribution effects. Everybody sees the ads, however the actual value of a pair of eyeballs is widely variable, by orders of magnitude so. It's therefore profitable to make the content free and distribute it as far as…
No one is saying that the fee should be flat. There are ways of selling roughly the same service for different prices - just look at air travel.