Yobit Investbox - it's not ponzi, you can check this video to understand how it works - https://drive.google.com/file/d/1IQY6Ly1pFCGM7e9jV5M7m4Sv78h7Y5jR/view

InvestBox plans for btc are limited and have strong conditions (user need to have some amount of Yobit tokens and e.t.c. to get his daily %), it's just an advertisement tool with fixed budget, if it ends - user can close his investbox investment and withdraw or exchange coins anytime.