The Morpheus person is trying to charge sats? Or just giving a private link?
The author of "The Bitcoin Standard" share the pdf for free: http://libgen.rs/search.php?req=Saifedean+Ammous+&open=0&res=25&view=simple&phrase=1&column=def
Only pay for physical version of the book.
This guy is trying to sell you a free pdf 💩 
Discussion
He download free pdf and charge sats for it claiming it's value for value 😅🤣🤡, he do it with nostr:npub1dpna3xwwddnhhzg9ycpvlcz2ze0jdwm2rf3eqd2lf9leaewtq7tqhw0ef2 educative pdf about btc too