If you are a developer, a reverse-engineering enthusiast, or a veteran desperate to play a pre-nerf "Release Day" Inferno Diablo: Spin up a VM (Virtual Machine) to isolate the client, use a throwaway email, and explore the Diablis open-source code.
If you search YouTube or Reddit, you will find a schism of opinions. Some claim that Diablo 3 private servers are impossible due to Blizzard’s "server-authoritative" architecture. Others swear by specific domain names offering "10,000% Legendary drop rates." diablo 3 private server
: Most private projects are emulators. This means they are often buggy or incomplete. If you are a developer, a reverse-engineering enthusiast,