Sorry to respond so slowly, just noticed this. What you have in Japan, Korea and France is not "net neutrality" regulation as that term has acquired meaning (and a rather confused one) in the USA. Probably you are talking about unbundling of the broadband access line. This allows competing ISPs to lease the physical facilities of the telephone companies in order to provide an internet service that competes with the incumbents'. Go to the OECD department of Communication Infrastructure and Services Provision (?) CISP and see the reports there for a comprehensive treatment of this issue