Here the OP has only listed the winners. But there may be many defeats history behind this winning.
Exactly, this is the main question behind the story whether are in profit or still in negative when they win that amount?
However, those who win here are lucky. These win will not always be happen.
No doubt about the luck, no one will win such a big amount without luck regardless how much they have lost/spent before winning that huge amount.
I can only hope that they can spend what they won wisely and hopefully they did not gamble more than what they used to do after the huge win.