The winnings posted by you I don't think its true, even if it is only one user out of millions would get that if he is extremely lucky.
I guess you are new to the gambling world. Go research the name "Archie Karas" and you will learn that this win is nothing compared to what he achieved. Its not impossible, but very, very difficult.
WOW! I become encouraged when I see the big win photos on the gambling forums, social media. My friends also prefer old-school gambling, they all think what I do in the gambling sites is a waste of time. Due to the scam sites, the trust level is at its worst level but the fair casinos will recover this sooner or later.
This is the problem people. Don't get encouraged by these big wins since they are basically rare to begin with. Invest only what you are willing to lose. Don't blindly pour all your money into these sites and regret it later on just because you observed others win this way.
I think the reason for big wins to be posted is not to actually encourage you to gamble but more like showing you what is possible and how legit a casino is. Just to give an example that 50 bitcoin bet on sportsbook that turned into 88 bitcoin returned is also a way of saying "here we are giving 88 bitcoins back to someone, 38 of it from us", so basically stake is promoting themselves as well on how legit they are and how much money they do give whenever people gamble.
We might be influenced by it and gamble more as well with the hopes of getting more money and that is even a bigger plus but I feel like that is not the main point of it, I feel like main point is to just show people there are people who gamble a lot and win as well aside from all the losers.