What business? What activities? On the website there is not a single word about fiat, they accept only bitcoin. That's why I said that I don't care about their legitimacy. I live in a country where bitcoin is not legitimate, so I do not care. And if it was about fiat then of course you were absolutely right, but it's not.
According to their site, they do something with your funds once deposited:
Once you have transferred funds and your Deposit has become active, your coins begin to work. Methods of raising funds are time-tested and all risks are minimized.
Income is derived by experienced traders, speculators, miners and entrepreneurs. We do not disclose our methods, but we can assure you that they work perfectly for a very long time.
Of course they are vague and secretive about what they do, but they do claim to "put your coins to work" presumably in some way that will generate a profit.
At the moment their service works, unlike those who are already failed. This is the main difference. And the chance is necessary because I need such services, and I am sure that I am not alone.
Ah the old "they are currently paying out" line. This is the nature of a ponzi scheme, they will pay out every time until suddenly they do not. They may be paying out now, but there will be a time where they will stop. Ponzis are not sustainable and eventually will shut down leaving many people with losses.
I'll ask you plainly, do you think they are a hyip/ponzi? If not, why?
Edit: Fixed quotes.