What's with your analysis? do you see that it is sustainable in the long run?
I'm only giving what I've seen in the past that there were projects that has the same rewarding system but eventually, became low in volume.
it seems that it doesn't make any difference with every project from ICO, IEO and now Defi might come up again.
if the one who moves it is intended to cheat, then whatever system is made it will not produce good results. for that always be ready so as not to experience ongoing fraud.
Projects that are into it can't sustain their loyalty program and rewards if there's no other source for the rewards unless it's just a very minimal that they're giving out.
It is attractive in the sight of investors but on the side of developers, they have to make sure that there's enough funds for it.