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.
Again, if you guys read this thread careful even just the OP, you would see that OP did not gamble to get 1btc. He actually got his money from affiliate links he posted. We aren't even sure if he did earn that much as he did not post the proof of it. He just stated it and share the link. Likely this is just a stunt to produce more conversion on that affiliate link.