It is one hundred percent that their are no gambling sites which are zero percent house edge , even if any site is claiming to be zero percent house edge then that site is runned by some scammer or it is run by some big rich person who just wanted to enjoy running his site.
Yes, i too agree with you there is no Zero edge gambling sites in this online gambling. If the house takes zero percentage then what is the profit for site owners right? If any zero percentage edge sites are, there means some scammers may run that site or the site owner will be a rich person.