That guy isn't a gambler. His an advantage player like how people make millions from poker or stocks.
There is a Romanian mathematician who won the lottery thrice, wrote some algo to predict the numbers.
Nah, there is no algo to win the lottery. That guy is just simply lucky. But occasionally you have odds in your favor when the jackpot rolls over to a very large amount. There are syndicates who buy up large amt of tickets when that happens. Also you should buy different numbers. E.g don't buy 123456 and 345678 in a 6/49 lottery as you repeat 4 numbers.
I was mistaken, he didn't win it thrice, he won it 14 times. How a Romanian mathematician hacked the system and won the lottery 14 times https://www.independent.co.uk/news/...ian-hacked-system-stefan-mandel-a8527556.html
So he used the same method that the previous poster, @HolyGrailSeeker mentioned. In the US, Jerry Selbee used similar method to win $26 million. They were running lottery syndicates buying millions of tickets. And there were other lottery syndicates as well.