These days we can get more bonus based on the amount being wagered, but there isn't no free money to play and get real money out of the same. Few sites provide free money, but those are very little and can be renewed once that were empty. Apart from this sites have got tokens that are a way to experiment the game and that doesn't pay real money.
If you really like to gamble you will deposit money and gamble with your own money. The free money from faucets, rains, etc...should be used to try the site, have a bit fun, but for more serious gambling, and making profit you need to deposit.
Try wolf.bet, you have free money, there's a rain, you can collect it and gamble for fun, but when you wish to compete for wolf race you will have to make at least one deposit.
And once you start gambling for real, free money is always too small amount to do anything and to have some real fun. Ita5like playing poker for free for some little prizes, it's not interesting.