In fact, there are many unpredictable factors: such as war emergencies, etc., which cause large fluctuations in exchange rates, huge spreads, and even two-sided fights. Heavy positions will be wiped out, and it is meaningless to earn interest on light positions. In addition, some foreign exchange brokers have credibility issues. One year is not a short period of time. What should I do if the company closes down? And it’s impossible for a big company not to charge interest.

If this method could work, wouldn't Soros and Buffett have done it long ago? Why did Buffett lose billions last year?