Yes so sorry, it's currently USA only. The plan is to add more countries over time. I edited the original post to make it clear the beta is currently USA only.
OP you should have pointed that out in your post also what's your reply about incentivizing people on going out for this kind of game/app? As I said earlier I don't think that this is the right time for you to release such app when people should be going out less and less because of the current pandemic we have. With your app you are actually encouraging people to go out more even if it's dangerous. Maybe have your app be more rewarding in having prizes indoors instead of being outdoors.
On the contrary, the period of publication and launching of this application is one of the best period from my own opinion
Reasons being that the application allow users/players to earn free bitcoin and ethu which are the best cryptocurrency in use
The developer also needs to work on the location preference since it allows only US users