First of all everything in this world is a risky gamble..every kind of investment are risky too ...but ofcourse for you to be able to manage risk in every investment especially in crypto currency you have to every little thin in it up to the biggest once ..how is it work.is it scam or not..and most importantly dont ever ever trust to anyone that says to you give them money and they can doouble it...so all you need to have are awareness and commonsense..
Ya absolutely right in today's world there are many scam who are trying to fool us like in starting they show interest in us and once we invested in that particular site then they just disappear and pretending like there is nothing so also in my opinion if you are going to invest then try to study them and then make decisions. Regards Happy Trading