I'm saying there are no natural monopolies that are not systemic infrastructure. The platforms you build other things upon are often natural monopolies, but tho

I'm saying there are no natural monopolies that are not systemic infrastructure. The platforms you build other things upon are often natural monopolies, but those I argue should never be privatized in the first place, so I want to hear of natural monopolies that are not in that category to justify the argument that some economic system will orient itself where one player can heavily exploit its customer base without introducing ample room for competition due to prohibitively high barriers to entry / time to market (where these forces are significantly higher than the prospective returns).