Not directly paid, but certainly indirectly paid using billions of dollars of tax-payers money in the form of corporate welfare payments and fiscal policies designed to boost profits. Tax breaks and various direct and indirect subsidies by government allow his company to make the profits that allow him to be paid as much as he is.

This means that anyone who believes there is a free market economy operating anywhere in the world is gravely mistaken. Arguably, the case of this janitor making lots of money is really not about public ownership at all. The public (via the government) effectively support both private and public sectors almost equally in a lot of cases.

Here's the situation in the UK at least:

http://speri.dept.shef.ac.uk/wp-content/uploads/2015/07/SPER...

Some are, and some are paid with government contracts.