So I live in the U.S and I have family in Korea. Obviously there is a great opportunity for arbitrage but was wondering if there were any downsides to it. I would buy bch/btc/eth here then send it to my cousin in Korea and she sells right away for 50-60 percent more. Is there anything wrong with this plan??
Absolutely not so!)
You in this case will be considered to have received a profit, which means that you are obliged to pay tax on profitability, it is not important your cousin or brother!