There is no gambling website with a 0% house edge because its something that they need to exist and stay existing.
A gambling website is not cheap,you have to understand that..
You are fully right about this, there are no gambling websites with an 0 percent house edge because they than simply would never make profit or money to build up their empire.
I think its possible for a gambling site to have 0 percent house edge temporarily for just welcoming for testers and players to try their gambling site, But it will not stay 0 percent permanently. The Website aint cheap. They need also a profit thats why house edge is created.