anything with referral level system is BS I call it pyramid scheme and going to make you lose your money sooner or later, avoid that kind of investing and learn how to trade or invest in ICO like other people do (as long you do research first of course).
No, Everything with referral system is not a Ponzi as you tend to get something from what your down liners are winning. Most of the time, when it comes to gambling, we all know the platform will always have a way to pay up. So, in the real sense, the fact that there is a referral system does not necessarily make it a Ponzi, it is just a marketing strategy which when used properly can bring about some good activities to your platform as an owner.
Now, this does not mean I am in support of this website, as I could not even see anything substantial online to want to use it, so I would say in this case, the OP should thread carefully, and not end up putting hands in the things that are not real, all in the name of trying to make quick bucks.