The problem is that most of the ideas surrounding markets in a post-scarcity world are largely all marxist.
Pure marxist thinking (not what the USSR/Soviet Bloc practiced) states that when the means of production out pace the demand of people you can start moving away from a capitalistic model economy. To a large(-ish) degree this is the state that software currently exists in.
The cost of serving a file to 10,100,1000,10'000 people are (not counting bandwidth) nearly identical concerning human labor. Which is the point that Marx spoke of. Technological infrastructure is a build once and wait. Continuous labor doesn't have to be supplied for production to continue (i.e.: a factory vs a web server or a router) nobody has to flip a switch for every packet.
The real issue is that software doesn't want to be associated with Marxism due to the stigma, but overall it is Marxism in practice. We just don't have better economic theory to describe whats happening.
I think "not counting bandwidth" is a dangerous simplification people often make when talking about the "post-scarcity world".
The whole debacle on net neutrality comes from the bandwidth providers. Bandwidth is ultimately the "ticket" that every internet user pays to join the party. It's a huge inflow of real-world money into the system.
This money is buying congresspeople all over the world (same net neutrality threats and ongoing law discussions here in Brazil). It's a key factor.
