I am in India and I can see the app on top spot (marked as Ad) when I search for Bitcoin Wallet.
My theory is, they paid for an Ad in a specific region and hence it started showing on top, people started downloading in that region, and that boosted the overall ranking for that app and hence people from other regions are seeing it among top results, even though its not an Ad there.
Irrespective of the rating or freshness of the app, since it is getting downloaded in one region (because it is an Ad there), automatically it goes to top in other regions.
This trick can be used by other apps also, considering it would be cheapter to buy the top Ad spot in India and then it organically rises to the top.
My theory is, they paid for an Ad in a specific region and hence it started showing on top, people started downloading in that region, and that boosted the overall ranking for that app and hence people from other regions are seeing it among top results, even though its not an Ad there. Irrespective of the rating or freshness of the app, since it is getting downloaded in one region (because it is an Ad there), automatically it goes to top in other regions.
This trick can be used by other apps also, considering it would be cheapter to buy the top Ad spot in India and then it organically rises to the top.