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Looks like they also offer the book for $3 “la la carte” (without a subscription) which sounds reasonable.

My bad. It used to be free and I just clicked through to the second chapter and that convinced me it was still the case.

At the bottom it says continue reading and it took me to chapter 2 and from there to 3,

Chapter 3 is locked - at least for me.

Though 3$ is probably a small price to pay for standalone version.