Till 73% of interest on your coins loaned, is it realistic of just a lark mirror?
I tried to lend stablecoin with 0.086% of daily interest, it seem to work for the moment.
I am not familiar with Kucoin exchange, but if it works on the same principle as poloniex, it's possible in short time such or even bigger %, I know from my practice.
Everything is determined by supply and demand, with a shortage of funds, interest rates rise sharply.