there is not bulletproof investments site all turn out as scams you better try your luck on dice games
not all investments are scams, you might be thinking of ponzi "investments," which are unsustainable and eventually end up to be a scam. you might want to try investing in a dice site's bankroll, which is essentially +EV in the long run, and should net you some money.
Don't call Ponzi schemes "scams." People know ahead of time exactly what they're doing. It's a gamble, not a scam.
actually many people don't still know that. and they fall for the scam and lose their money. that is why we see a lot of surprised people who are mad and say that we lost money on ..... website who claimed to double our investment.
another thing to keep in mind is that they never say that we are going to end our services after .... days and run away (stop doubling) they always claim
we are legit and we are here to stay blah blah blah and that is scam in my book.
Common sense would tell you that these are HYIPs (aka Ponzi schemes). Anyone that can't use common sense deserves to have their money stolen. If websites could offer 100% returns every 24h, why would every investment firm in the world not be investing in those, and instead be investing in stocks that give a much lower return and often lose money? Protip: because no site is really able to give 100% interest every day and sustain it. This isn't rocket science.