I am not 100% sure but, from what I have seen in waves exchange desktop app, I think it's something like a decentralized forex trading platform? DeFo: Decentralized Forex? Sorry in advance if my answer is wrong.
Cited from your link: "So basically, you get 15% interest from staking e.g. Euro € or Yen ¥"
That 15% interest rate will not finish good for the most of the people. There are many PoS coin examples with high (much higher) interests. Where are they now? How big is their market capitalization?
Bitcoin inflation is now very small which is good.