Winning 1 bitcoin is hard for those that doesn't have big capital but we are going far from the topic. I admire this type of person for being resourceful and he earned that much from those gamblers that he didn't know. I thought before that referrals aren't working anymore but this made me hopeful and wanna try referrals soon.
If you are having a good day then you could make a good amount ,even more than a bitcoin with just 0.05 btc, i have done it before and cashed out but the problem is i could not repeat that feat after that,i had one lucky day and i made the most ,it is all about luck.
depends on the game in which you have participated, if you play chess for money, you need knowledge, if backgammon the skill and luck, and if one-armed bandit, then good luck.
Yes, Is it possible to earn 1 Bitcoin basically made 1 BTC or over in one night from a gambling website depends on your choice of the game and obviously your luck. If you got lucky and hit 2x in over night might earn more than 1 BTC. But, It's not an easy way to make a substantial amount of Bitcoins from gambling.