Does Santa Claus exist? The literal answer is yes, there is a good white-bearded man named Santa Claus who lives in North Pole, Alaska. But that's not the Santa Claus people really want to see exist.

There are two obstacles to socialism: scarcity of physical goods and services, and censorship laws called copyright and patent. Without copyright, Santa could come much closer to existing. He could give limitless music, books, art. But at least he can give from the public domain and cc0 works.