That's a very liberal use of the verb "pay". Payment is not the same thing as compensation, payment implies money changing hands. "Licensing" does not have to

That's a very liberal use of the verb "pay". Payment is not the same thing as compensation, payment implies money changing hands. "Licensing" does not have to involve any sort of payment (or even compensation). There are free software licenses with no compensation requirements at all, yet they are not covering public domain software.