If it is too good to be true dont go for it.
In all honestly trust your gut and look for signs that you see in scams.
Even if you find just one drop the site, cause there are hundreds of more that could use your investment in a legit way.
This is about the same rule as i have with any investments there is. If it is too good to be true, it's probably not worth it. The idea is you get what you have. Invest wisely, make some efforts and it will profit for you. But too good to be true stuffs doesn't just cut things for me.