Who would invest in scams if we know it beforehand, that is why investing is very risky because we are not in control of our money but we have to do it, take risk in order to grow our money. If you choose to gamble then your chances of success if definitely lower than investing, that's the real story here.
It is the same if you gamble because you need to deposit money to play. People are not going to be able to see if the site is going to scam or not that is why you should choose which . It is also part of the risk so it is not something that we can avoid even if we decide to invest our money into the site