"Up to 40% per month" if you look at their realtime interest chart you see that it is variable. What this means is it only pays out a % of earnings from the trading bot. If you look at their new road map you see in a few months the trading bot is getting an upgrade. The bot is legit and has been confirmed by Roy Murphy from the unoffcial Bitconnect channel. Now classic Ponzi's guarantee a daily %; how can you guarantee a fixed rate daily? the answer is you cant and thats why Bitconnect is not a classic Ponzi and is in fact sustainable. Like I said there is a whole lot more to their whole business model that makes them sustainable but I would have to write an article.