IMHO gamblers lose, on average, way more than 1% house edge
That is exactly what worries me, it is not as simple as they claim it because of 1% house edge.
I think there this more going on behind the curtain, which is not right.
I understand your concern, I myself have been looking at the figures and saw that too many gamblers had not 1-2 or even 5% loss
many were like 20-50% (especially the ones with only so many high roller bets) in the red
but as I pointed out above, people do not know how to manage their banks ,they chase loss, they engage in extremely risky martingales etc.
I do not exclude the possibility that casinos cheat, but this would mean the whole cryptography and provably fair is flawed and all of the owners are conspiring against us poor gamblers
which is very far fetched
RHavar explained it perfectly , reread his posts in this thread