How is it a myth? It has 2.5 billion fans worldwide (in comparison to 3.5 billion for football). That’s 1 billion in excess of the entire population of India, so clearly there are some fans elsewhere!
You’re perhaps forgetting Australia, New Zealand, South Africa, Zimbabwe, the Caribbean, Afghanistan, Sri Lanka, and various countries in SE Asia apart from India (e.g. Bangladesh, Pakistan).
A better metric is the average % of likes from ALL countries.