That is an amazing profits, well I wish him all the best in future bets, I guest persistent and smart gaming skills made this huge winning possible. I wish I could learn some of his techniques.
Without wanting to destroy your view of the world, there are no special gambling skills that you have to learn in order to achieve correspondingly high profits. As a player, you have a certain chance of winning that is always lower than that of the casino (the so-called house edge).
If you achieve very high multipliers at bustadice, for example, this has nothing to do with the fact that you are particularly good at the game, but you are simply lucky. The more games you play, the higher the probability that you will get such a lucky punch once. Here, of course, scripting options, such as those offered by Bustadice, help a lot. However, you should not forget that you lose a lot of money on the way.
So in the end it comes down to pure statistical probabilities.
And also Bustadice allows user to win high amount as limit so we can see more whales are playing often than other platforms and you are right though, there is no strategy involved while playing dice, just keep the roll button again and again until you feel you won enough amount of money.