winning a parlay bet with an amount of $ 523k is very big, he is really lucky or maybe he is a professional gambler who has knowledge in sports betting such as the NBA.
When a player is betting $10k then he surely is taking a big risk and we can make assumptions that he is big whale so he is ready to loose that amount.Second he must be having knowledge also about the players otherwise risking this amount in sports betting doesn't work.But surely luck favours him and he has made big win out of this match with x55 hit and now he must be enjoying his time gambling

This is how luck can shower profits on you.
I followed several whale gamblers they always share big wins the majority of bets are only on sports and on a single bet or 2 matches in 1 bet
If there is a whale who takes 5 to 7 matches in one bet that is clearly impressive even though he won it it was only luck
This means that gamblers who only rely on luck are definitely more losing I mean when he is active as a gambler.
Where do you see the transactions and bets of whales betting with larger amount? I am asking with respect to the Duelbits site ?
I don't think there is any way to know how many money is being put in by the whales on any gambling game or on a bet. Yes, someone come up here or on social media stating that he placed a bet with this much amount, that's a separate thing but we cannot get these stats by ourselves.
Also i think gambling sites are also not allowed to public these stats as it is against the privacy policy to disclose the gamblers gambling fund.