It's simply that the sites may have some reasons by refusing to pay that woman. This has become a common problem for sure. That's why people who didn't get paid will always try to blow up the case to make sure that will be pushing the sites to pay what they deserve by winning the big reward.
So many problems happened with the various sites started from that. That's why we must be careful with any of gambling sites. that's a lot of money. The sites must try to pay what they can affort to pay it.
I think that this gonna be a long term problem since the winner will not let the site will not pay him. That's why stay away from the casino that was offering non sense reward. They have high chance to not pay.
Resorts World Casino is not an online site it's a real casino. We will never know whether the slot machine is faulty, but one thing is for sure they are making use of their TOS to avoid paying the woman's jackpot money. If in case the machine is malfunctioning will they be refunding all the money they have earned while the machine is faulty? I guess the story will not be the same.