[OkayPhysicist]

I think another, bigger, piece is that people have more issue paying for upfront costs than marginal costs. Most people will have some sort of outrage that their medication costs the manufacturer 30c to produce when they're told it'll cost $30 to buy. Sure, there was the whole discovery process that had an upfront cost, but to most people's intuition, the cost of goods should be "cost to make + some small markup".

For a webpage, the marginal cost is approximately zero. Certainly there was an upfront cost, in that somebody had to write the thing, but the cost to pass it from the server to my phone looks like rounding error.