Gamble or Invest IMO 
i think invest and gamble is same here, because both need very big risk, 95% of investment sites will become scams , until you get back the amount you have invested, while gambling you can get rich fast or lose everything, while investing lose it will happend slowly
yes you are right. invest and gambling the same having a big risk. but there is an investment with little risk, such as lending and mining. I've been doing this for a long time and is still safe till now. but for lending you should really pick people who really has reliable.