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.