Well, when i was new in bitcoin field, than always i spend my time to search the free bitcoin sites. But i learn from my experience nothing any sites here where we earn free bitcoin, except faucets but they pay very low and in this way, we can't earn 1 bitcoin, except gambling is only way where we earn fast but on the risk. So i choose different ways like hold the bitcoin and also i try to do altcoin trading.
Gambling will give you 1 btc in a day only if your are lucky enough and its not totally free as you will invest some money to gamble and may be you will also loose whatever you have invested in it as gambling is totally based on luck and I think its a worst way to depend on gambling to earn bitcoins.
Gambling won't "give" you anything unless you are either gambling your way up from a small amount, but there are barely any realistic chances of you succeeding in this, or you will have to put 1BTC at risk, and place a dice roll at 50% minus the house edge to nearly double your bet. It's not worth the risk. Also, there is no such a thing as investing when it comes to ordinary gambling. It's pure gambling. Investing when it comes to gambling is when you supply coins to feed the bankroll of a certain online casino.