Bitbetria is a Bitcoin investment program launched mid-December 2016. Their official statement to how they earn this interest rate is, that it is done over cryptocurrency trading. Which might be true, but we don’t see any 100% convincing evidence on it!
They currently (30.12.2016 have 871 investors). This let us believe that Bitbetria might be here for long enough that we get more than our initial bitcoin investment back! With their offered daily earnings of 3.96%, we have a profit from day 26! Which is totally possible.