I believe it was not $500 bet but it was $50k bet (buy feature) as we all can see under the Big Wins leaderboard of the Sweet Bonanza game.
The players did it many times obviously as there is 1 username only for the top 3 on the leaderboard.
Only huge whale who can afford to bet/buy feature at $50k, I wonder how many negative bets he got while playing that game but I hope his big win $2.5M gave him a nice profit for his gambling session.
It is still incredible, 50k bets are not something to scoff at and 2.5+ million win is unbelievable, even with a 50k bet. I know that he may not be in profit like "he wagered 500 dollars for the first time and won 2.5 million" which many people think what happened, but the reality is that even with the current situation, that dude is actually doing great, there is really not that many people who walked away with 2.5+ million dollar profit in crypto gambling before.
Plus he was capable of withdrawing it which tells me that dude just got out as soon as he won, that is a very crucial information because there are so many gamblers who win and they just keep playing and playing until they lose, that is something we wouldn't want him to have, it is much better that the dude got away and moved on since that would mean he wouldn't be losing it gambling for longer.