> The linked site is very clear about how the pricing works.

Yes, it is.

It is also, very obviously, placed in such a way to reduce the bounce rate off the landing page and increase conversions.

When was the last time you were on a site that had meaningful content below its "releases" section?

Why is the answer to the "How do I pay?" FAQ question bend over backwards to first say >Hyperspace is a free download in the Mac App Store. Once downloaded, it’s free to scan an unlimited number of files. Scanning will let you know how much space is eligible to be reclaimed.

Why doesn't the app store description say which capabilities are free and which are paid?

One or two of these are innocuous, but there are are a dozen small choices like this that have been made here, all aligned to increase the likelihood of one thing: Put the user in the position where they've already installed the app, sunk some time into it, and are anticipating the benefit before making it clear that they have to pay money.

That the page technically contains the words "you will need to pay for Hyperspace" does not mean this isn't a dark pattern.