The problem I have is that it is not clear that cyberspace is a space, [...] These physical, 2-D and 3-D concepts do not map well to cyberspace.
A mathematical space need not be linear, even locally, and therefore it need not have dimensionality. While the use of the word space started as a reference to our spatial experience, it has generalized out of that restriction.
For a concrete example, who owns the Cypherpunks list? Tim and Eric started it, Eric keeps the software working, and John Gilmore supplies the machine, as I understand it (apologies if I am leaving someone out).
Here's how I explained it a recent cypherpunks meeting: John Gilmore is the pope. He owns the hardware. Hugh Daniel is the cardinal. He does much of the maintenance. Eric Hughes is the king. He looks like a figurehead. Insert your own conception of divine right of kings, etc., in order to complete the analogy. Should I ever move the list to my own hardware and net connection, I get to be Napoleon. Eric