Right, interesting line of thinking.

If every person on earth owned some amount of bitcoin, would it then be considered a public good?

You have me really thinking (and confused) about the definition of public and private. I'll have to think more.

Maybe this is where people take it to one of two extremes: either most things are public goods, or most things are private goods.

Some portion of the vigorous debate surrounding contentious topics may boil down to difference of opinion on what is public vs private.

Interesting points!