Ah, I see what you mean.
Maybe this was a later addition but it is clearly stated now, at least, that chapters 5 and 6 are on Patreon (near the top of the page).
With that said, I'm not entirely sure what you mean by C. Why shouldn't not being able to afford something mean you can't access it? As someone who is also on fixed income due to a chronic disability, I sympathise with your plight, but unfortunately life isn't fair.