The most heard question. Here is a fun answear.
Here are a few really good source to know more, this is an animation for fun, not too much info just enough to have a laugh.
https://steemit.com/steem/@arhag/where-does-the-money-come-from-a-look-into-the-economics-of-steem
https://steemit.com/steem/@beanz/where-does-the-money-come-from
▶️ DTube
▶️ IPFS