This statement by Dion from Q&A video had me really thinking again.
From 1:43
"....we're currently been running betas in our other 4 countries that are available for performers. But it's available for fans around the world."
After reading the terms of use, I'm leaning towards this app going to be available outside the six countries competing.
The Terms of Use mentions a lot of other countries not participating. Why would Megastar set an eligibility criteria if app is not going to be available for download to those countries?