They changed house advantage for slots. When it started I could turn breakeven, now I lose almost every bet.
The edge for slots, is as always, 1.75%. You can check the bet history to see which rows users used to play and compare them to now, you'll see the reels which the used, and the rows (aside from custom ones) are all the same.
The reason for anyone winning or losing is how lucky they've been, sometimes you'll win big, sometimes you'll lose.