Bitconnect, BCC, has been going for over 12 mths, in that time coin price gone from $1US to now $230US, tracks BTC & pays 1 to 2% PER DAY from theri lending program.
Yes no doubt they are ponzi even though they say they are making profits from trading BTC & make heaps from exchange transfer fees.
Regardless in 3 months, from BCC, I have got my capital back & more & now just earning free coin every day, pulling some out of cryptos and re-lending some into other lending programs like WCN & HXT
There are now quite a few copy cats but BCC is still biggest by far & the best managed.