How to see which countries the app is allowed?
Sensor Tower overview says USA, Canada, Brazil form 90% of user base remaining being others.
Sensor Tower Reviews shows Mexico and Saudi Arabia. 


That makes it 6 countries, including India (I see it on Play Store). You could write to them and check for a full list.

Edit: I mailed them using Play Store support mail, linking this question and they reverted very promptly. Non availability in some countries is because of GPDR issues. Details pasted in chat.