I am very surprised to hear that your son accepts Wikipedia references in essays, M0nika. I have never known them to be accepted, and I don’t understand what difference the subject matter makes. In my experience they are looked on as a sign of immaturity in a students who does not understand how Wikipedia works. A decent article will be fully referenced anyway, and there is nothing to stop a student from following up the references and quoting the original sources, as they would be expected to do if they read a reported source of information in a book.
I agree about paying for things we use though. I know people who would never pay for a downloaded knitting pattern, for instance, or an app, and expect kindle books to be free. That attitude denies people the chance of making a living from their art, and I don’t know why these people think that others should work for nothing. It’s not the same as giving to charity, IMO - it is simply paying for a product, whether it is tangible or virtual.
As I said, I do use Wikipedia, but not often enough to feel that I should pay, whereas I do subscribe to the Guardian, as it is the UK’s only independent newspaper, and I think it is important to pay journalists to provide news that is not influenced by media owners.