There have been cases in both online poker (Potripper) and streamed games (Mike Postle), where someone gained access to see their opponents hole cards in real time. However there are no known cases, where someone has been able to know, which cards were coming. Moreover even if someone actually had that knowledge, going all in before the flop would usually not be the best way to take advantage of it, since often this should just cause everyone else to fold. And then it does not even matter, what cards were going to come.
So as others have said, you have just watched someone, who was on a heater. If you flip a coin 10 times, then 1 out of 1024 times it will be either 10 heads or 10 tails. And if you think about, how many hands you watch in online poker, then of course you are going to see something similar happen to someone once in a while. And this is then the times, when they end up with a huge stack in a tournament.
As someone suggested I actually looked this player up on SharkScope, and he has not opted in, so its not possible to see, if he is winning or losing. But SharkScope list his ability as 62 and his average buyin as just over 3$. If someone is a solid winner, their ability will typically be higher than 70.
And as others have said, if this guy had actually found a way to crack the security of PokerStars, which is pretty much the gold standard in online poker, would he really be sitting in a 1,1$ tournament? Why would he not be playing the SCOOP events or the Sunday Million or anything, where the money actually matter?
Sure you can look at Mike Postle and say, that he cheated in a low stakes game. But this is because, it was the only game available on Stones, and other casinos had better security, plus his insider was not working there. If however you cracked PokerStars security, you could play any of their games, and noone in his right mind would then waste his valuable time on a 1,1$ event
