I have a question about leaving my money inside an exchange. It says i will earn 15% annually if i leave my ethereum inside the exchange. so if i have $80,000 worth of Ethereum. I will get $12,000 per year for leaving it in there? My exchange is Hotbit.io and it actually got hacked recently. But yeh. I heard coinbase offer this too. im not sure. Is this APR thing Good??