Because moving USD across borders usually includes declaring the source and type of income and taxing it. Bitcoin looks like a big tax-evasion scheme at this mo

Because moving USD across borders usually includes declaring the source and type of income and taxing it. Bitcoin looks like a big tax-evasion scheme at this moment because 1) laws aren't clearly defined and 2) governments are unable to track what is going on unless BTC is converted to/from fiat.