The lack of discussion on reddit or here is worrying
Here's a review trying to analyze what little information is available: https://bitcoinexchangeguide.com/firstcoin-club/
The way their information is structured suggests to me that it's ponzi scheme, with all the talk about passive income and the secretiveness about any other aims.
And with 100% premine - you are just giving money straight to them, so I think they need a much more solid case to persuade people to invest, other than profit with nothing in-between.