The problem with your reasoning is similar to coming with the highest possible number. When you figure out a number, someone will say "that plus one!".

Whatever standard of free service you establish, someone with resources can surpass, but needs to be motivated to do it by the perspective of a return of the resources spent.

So either hinder development by forbidding the commercial stuff altogether, or tax all people and then finance authors from public money, but hopefully I don't have to explain how wherever this model is tested, the society degrades towards famine.