This is certain. For different countries there should be different prices. Since a person will prefer a pirated film than pay a large price for it.
I think the intention was also to focus on low income countries first. And i believe this is smart, that is a market that can probably use a streaming/Netflix type service, but can't really afford Netflix.
Maybe the language could be a chance to use different prices.
To use a ID to set the country would have a good result but needs lots of effort before watching a movie.
If they are offering different prices for different countries what would someone stop from using a VPN to get the cheaper price?
if you charge people the right price it wont be worth the hassle doing that