You're welcome to license the things you work hard to create under permissive terms. I like knowing I can send a C&D to a billion dollar corporation and generally expect action. As it is, plenty of people find their art in department stores sent in by people who didn't have permission. A simple notice deals with it.

What do creators do when those billion-dollar corporations have no risk from selling their art, which has an opportunity cost to make, without permission or compensation? It may cost little or nothing to reproduce, but it's not free to create. Control over reproduction makes the creation viable. Otherwise, they have to spend finite time and energy on other things to survive.