The internet is not the same as a food place. People expect and have gotten used to services for free. If you put a price tag on a software library, you obviously discriminate against students and poor people.
If you don't have the money to buy a big mac, you either eat a cheeseburger on the dollar menu or go home and cook a burger yourself.
If you don't have the money for the software library, you either choose a lesser library, or go write your own.
A larger problem however is many are considering the internet a fundamental human right, which it isn't. Might be nice to have, but a fundamental right it is not.