Privacy is a commons

“The commons is the cultural and natural resources accessible to all members of a society,” quoth Wikipedia, “held in common, not owned privately.” We live in an era of surveillance capitalism in a symbiotic relationship with advertising technology, quoth me. And I put it to you that privacy is not just a virtue, or a value, or a commodity: it is a commons.
You may well wonder: isn’t privacy pretty much definitionally “owned privately”? What does it matt