If a platform admits that it's a Ponzi scheme and you still proceed to invest, the joke is on you, or you are unaware of how a Ponzi scheme works.
Haha it can be a strategy.
I know there are actually folks who invest in ponzis knowing it's a ponzi. Their reasoning is typically because ponzis tend to pay those who got in early so this scam could be targeting those kind of folks. It's a flawed reasoning and extremely risky IMO as we don't know what's an okay amount for scammers to exit. They could always do it couple of hours later for instance.