Netflix needs to obtain the rights of TV shows and movies from studios to stream them on the platform. They also make original content in-house and hold exclusive streaming rights for these shows. BoJack Horseman and Stranger Things are a few examples of these Netflix originals.
Not all shows will be available for streaming worldwide, and one reason for that is the lack of streaming rights for a particular region. Netflix cannot buy TV show or movie licenses if no one is selling them in that particular region.
Using data such as the shows you’ve watched or the ratings you’ve given, Netflix is able to learn about their audience’s viewing preferences. They’ll then use these metrics to determine potential TV shows and films to acquire in the future.