You want to avoid countries that have bots and click farms at all costs – these will make your numbers great inside of the Facebook ads manager but will not translate into actual streams inside of the Spotify For Artists dashboard.
Although you can experiment with other countries, you need to carefully watch this to make sure you are indeed getting streams from those countries – otherwise Facebook will optimize around those countries and only spend your money in those countries, leaving you with no streams and no money.
To learn how to properly experiment with running ads to different countries, refer to the “Tier 2 Countries (And Beyond)” experiment found in this lesson: Experiments For Optimizing Your Performance.