Distribution rights aren't cheap - and while electronic ones would be cheaper, buying them to cover the world wouldn't be. Plus, you'd have to find advertisers

Distribution rights aren't cheap - and while electronic ones would be cheaper, buying them to cover the world wouldn't be. Plus, you'd have to find advertisers for each individual country (which would be a huge pain in the ass) - without that, there's nothing to offset the per-user costs in those countries without contracts.