A) Phyical books cost way more to buy than they do to print. You are mostly paying for the writing/editing.

B) Youtube is nor charging anywhere near “real” prices for their subscription. Renting movies on youtube is generally in the $3-$5 range, far cheaper than seeing a movie in a theater. The subscription gives you unlimited access to almost their entire library of videos and music. The only physical analouge is a library, but those only exist due to government funding and a quirk of copyright law that does not apply as well in the digital realm.