My thoughts on this. There is a RNG, and I think it works just like playing a slot machine.
There is a % payout, frequency of wins, etc etc.
There are a LOT of "setting" that can be tweaked.
If you take a sample from all the players, it will seem fair and random.
If you take two separate players and match them, once will have a higher luck rate than the other. I also think that the owner of the site is able to change these settings just as they would on a slot.
My reasoning behind this, is on Natural, I won 3 tickets to their main event Day 1 in the last two weeks. That means I made it to the top 20 and below (Or higher depending on which way you look at it)
Each time in the Day 1 event, Something ridiculous happens, like I get AA in the BB.
Couple of limpers and a min raise, I raise pot. 1 limper calls and all else fold.
I flop an A making a set I raise pot on the flop, limper calls, I raise pot on the turn, limper calls, I'm all in on the river, limper calls.
He hit runner runner on the turn and river to get a straight 6 high with no flush draw possibilities.
By no means am I a pro player, but there are a LOT of situations especially in these big money tournaments where strange things happen.
I've learned, never go all in against a bigger stack than you, no matter what your holdings. 99% of the time....you will lose.