For me to invest is more safe than to gamble because it is less risk than gambling. You just know the date of the opening of the investment site and see to it that it is paying. To calculate it also when you gonna pull out your money from in the investment site. Not like gambling that you need luck to win in the game.
Gambling and investment are both risky but they have different purpose if you will based on the people who are doing it, most gamblers are not getting their goal which is to make money while those who spend time with their research on investing are enjoying the fruit of their labor.
It is easy to understand where your chances is better, gambling does not give us an edge while investing depends on our knowledge and skills.