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How so?

Probably because it circumvents the price of submitting your email address.

You don't have to submit anything.

Don't you have to submit your email address to gain access to the PDF?

Yes, and doing so also auto-subscribes you to a list. Not that I mind, but it would be nice to let someone know beforehand.

I did NOT get that. All I got was a direct link to the book.

You people are stuck on the wrong side of an A/B experiment. Tough luck~

I find it odd sometimes that people don't take the same attitude towards Adblock. Sponsored links are a price too.