What people have been missing out on the "zero house edge" is that its a marketing effort obviously. They are doing a heads or tails game and hope that one day people would come over and play there without the casino itself gambling. It would mean user 1 and user 2 playing against each other and whoever the winner is the casino doesn't have a house edge since they are not in the bet themselves.

So, there is no house edge because its not a game house is involved in, think of like poker games where you play against each other. Now do they have rake I have no idea, maybe they do have a rake or maybe they don't but that doesn't change the fact that there is no house edge part. So its a marketing effort to say zero house edge in game where there is no house anyway.