Granted; since not many people keep $4000 worth of cash outside the bank, nearly everyone in the world gets the money. For many people the foreign currency is useless; there are plenty of poor people in the world with no access to banking or currency exchange. Despite this, the sudden increase in currency in the world, without any increase in capital to back it, causes a global economic crash - $4000 times 7 billion people is not a small amount of money. Creating more money without capital only lowers its value. Runaway inflation takes hold throughout the world. The end result, combined with the effects of COVID-19 on the global economy, is the largest financial crisis in history. Eventually someone finds this forum post, and soon the entire media is declaring you the cause.
I wish I had a little more self-confidence.