Their website is Eth.limited, isn't it?
They have developed their project from 2019 but their website was registered on 2020-01-12 and could not found the owner contact information.
But why did you call their project is a ponzi scheme project?
plans do come first before the site . they call it a ponzi based on thier specification above , the profit is based on multiple levels .
i wont wonder anymore why you cant contact the owner and if you found other strange details because a ponzi are likely can end as scam . nowadays we can expect more of this due to the rise of etherium . people are now starting to get greedy again if how can they earn etherium easily