No, if you read their terms they promise nothing. They basically say the whole thing could blow up at any minute. That said, they have been around for a year. Maybe you're thinking about their earnings calculator where they use the average returns from the past 6 months to calculate approximate future earnings (which is close to 1% daily).
That said, I'm not sure it's a ponzi scheme exactly. When you buy traditional stock, you buy them with cash. When you buy their coin (their "stock" if you will), you give them bitcoin. Then you lend their coin back to them. So now they're holding the bitcoin and their own coin that you lent back to them. Now they have two assets with value that they can pay you a small percentage of. Bitcoin tends to go up in value, which again they can pay you a percentage of, not to mention buying their coin in general creates demand which drives the price of that coin up too -- more growth that they can pay a return on.
BCC (bitconnect coin) is also traded on half a dozen exchanges. So, there are a lot of legit companies taking a gamble on it if it's a ponzi scheme. Also, ponzi schemes don't normally give you an asset in return that you can exchange elsewhere that is documented on a public blockchain; bitconnect does (unless you lend that coin to their trading bot).