Casinos could change one of their games house edge to 0% if they're very desperate for players, volume, etc.
i saw someone on gambling board that promotes thier gambling site with a zero house edge . i forgot thier site name but they said the site was still under construction . maybe that is thier way of promoting it so that they can expect to get a lot of costumers but we dont know if they are legit or just only a scam because i dont see any legit zero house edge gambling site so far that is working properly till today .
but if they want their casino to last longer they need to at least have games with an house edge or profit somewhere else( like selling ad slots on their site or charging withdraw fees).
yes . this is what popular casino/gambling sites are doing . we can see that they are still alive right now but they still have an average of 1 percent house edge .