No house edge? What the hell? Then how the hell they fund themselves? By advertisements only? It doesn't any make sense to me. If there is no house edge, that means there is no house. Only the players.
Perhaps instead of being stupid and reading only one thing, you may be able to see that the regular pools have the buy-ins paid to the winner. They fund themselves by playing against other players. What's so hard to believe about PvP? Though, the free pool has 1 BTC guaranteed. That obviously is for potential marketing purposes.