Just do the Math.
If the interest that they promise was real, there would be more money in BitConnect than in the entire rest of the world in a very short time.
Do the Math. It won't take 10 years before BitConnect will have more liabilities than there is money in the entire world with its promised interest rate and it will come down crashing well before that.
At 40% "risk free interest per month" (lol) BitConnect would grow from its current 635m to 36b in just 12 months, to 2t only 12 months later and to 115t another 12 months later.
4 years from now BCC would be at 6,6q and thus surpass the global derivative market 6 times over, which is already orders of magnitudes larger than the global money supply M2.
If you think this is sustainable you have just proven that you have absolutely no fucking idea how finance works.