https://en.m.wikipedia.org/wiki/Subjective_theory_of_value

You need to understand that value is subjective, and the value you pay for my content/art/program is the perceived value you got from it.

Open source, open content, non-priced content enable users to pay whatever they deem is the correct value for that information, it has nothing to do with a piece of content being "my" intellectual property and you not being able to copy it.