3 ms·

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

• mahmud 14y ago
  You don't have to submit anything.
  • aymeric 14y ago
    Don't you have to submit your email address to gain access to the PDF?
    • mgcross 14y ago
      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.
    • mahmud 14y ago
      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~
• timrichard 14y ago
  I find it odd sometimes that people don't take the same attitude towards Adblock. Sponsored links are a price too.