It's probably also 'collateral' damage. Those people who say 'oh I forgot my money' or 'oh I didn't mean to print out so many sheets, can I just take the one I want?' Or ' oh I didn't mean to press colour I just want black and white...'.
Library printers use toner not ink. It's 10p b&w in our library, 50p colour, internet use is free.
A library will be paying for broadband and their own WiFi will be filtered.
Dissing the library is Not Cool.
Ours has free job clubs and cv help, free computer buddies, free digital courses, CAB drop in, FREE bounce and rhyme sessions and story times for parents who.just.need.to.get.out.of.the.house.and.have.some.company.
you aren't charged if you are printing out council docs like hmrc, benefits claims etc.
It is the most egalitarian, non-judgmental, accessible-to-all space in the community. If it wants to charge 20p for a printout, then fair play.