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africa ott broadband mobile tax revenues taxes uganda internet dr congo facebook mobile broadband free internet connect next billion south east asia business model separation of access and service platforms south asia freemium internet freemium oecd baskets indeces webfoundation zero rating a4ai next billion eiu gsma itu cameroon cto big data ai spectrum regulation fttx mpesa mobile money otts ip transit content application platforms digital service tax digital economy covid-19 evidence nigeria internet value chain over the top social media ict4d benin economic impact