It may be worth delineating "how much" taxpayers have paid for it. For example, many H-wood productions leverage huge tax benefits in their budgets, to the extent of pitting states against each other for better discounts or outright 'grants'.

So arguably to some measure, taxpayers pay for H-wood productions too... (or for that matter, the products of any corporation which leverages tax giveaways, trade tariffs, or any other government - provided handout). Government $ is taxpayer $.

Some papers were written by self-employed people or by corporate employees. Is it okay for these papers to be restricted?

Then give me your credit card information, because I have no health insurance and it has been 5 years since my last checkup.

Edit: The parent's reply was "yes" when I replied.

Edit2: I am unsure which "free" you are referring to. Maybe all knowledge should be "libre", but I hesitate to say all knowledge should be "gratis".