House edge is the only avenue where the gambling industries are using to make their own money, though this charges varies from websites to websites and the percentage also differs however 0% house edge gambling site should not be trusted because they will eventually scam you.
very likely that the house manipulating edge them to attract players to come in, see a lot of players looking for edge low to be a gamble for them, then do not be surprised if a lot of gambling sites vying race to have the edge is very low, but if one of them said that they have the edge 0%, I can assure that they are crap and maybe will scam you
How about they promotion that they offer for you? Does it means they will be some crap? Amd how about other site that give you 0.xx? Does it onclude to your 0% house edge? If it is included so that site will be crap too? AFAIK there is still depends on their site too. Some site offer 1% house edge will scam you too though