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Can you specify what country do you reside? There’s a lot of factor Stake consider when adding fiat currency because they need to setup bank accounts and do some legal work just to accept your fiat currency.
Also they consider too the number of active gambler registered on Stake that reside on your country.
It’s not that Stake doesn’t believe in your country because Stake wants customer as much as possible.
I am from Venezuela, a country which has been suffering a economical crisis for years now, to the point there are millions of people who have decided to flee this country and spread around the world. We don't only suffer from an economical disaster, we also have a very corrupted and autocrat system where the military is at the top of the power management.
I assume it is not only about the number of gamblers, but also it may have something to do with sanctions the United States and the European Union have imposed over this country. So stake does not want to get in trouble with any western government, only allowing people from here to deposit through Bitcoin and other alternative cryptocurrencies.
I also think it would be a hassle for Stake to try to keep liquidity and manage our local currency, which is always losing value...