Invest only in gambling sites with perfect reputation.
Yeah after the recent Cs Go gambling site scandals the same could be the case in bitcoin casinos. Owner of these sites could just play themselfes to take money out of the sites and all investors would need to cover it.
Just make sure the site is actively used before investing it.
Yeah, not only gambling sites, also different sites are fake, so i suggest whenever we want to invest so firstly you should have the satisfaction about sites than invest it, i never say that all sites are fake but mostly are fake and some sites are really good sites and they are giving very good paying. But in gambling, i think more opportunities are here to earn the profit.
As an investor myself, I have invested on Video Game Stocks for sometimes like Activision Blizzard and some like Electronic Arts (EA) but not gambling sites so fake issue isn't a problem but on here in bitcoin. I don't see these gambling sites however on stock market but only here on bitcointalk.
ponzi are easy to spot but the legit it isn't though, they all look ponzi actually even coins get to become ponzi.