Hi Dang, I don´t see anything bad on the interest more than 100% a year. I personally made even more just holding the BTC in 3 months. Look at he graph of BTC for past 3 months - if you bought BTC on 1st June - you paid for it $2400, today it is $4800 - that makes a profit of 100% in just 3 months. The cryptocurrencies are so volatile that 1% a day is absolutely ok in my opinion and I am talking about holding only - imagine you have a bot that trades for you (there are bots doing this you cannot say it is not true).
I can recommend this article so you will see that 1% a day (which is not guaranteed) is, in a fact, quite pathetic https://steemit.com/bitconnect/@cicnos/bitconnect-how-does-the-trade-bot-operate