HoYoverse is aggressive. They successfully shut down Genshin Impact private servers like YuukiPS and Grasscutter via DMCA. Anyone running a Zenless Zone Zero private server is on borrowed time. Servers tend to disappear overnight, taking your progress and any "donations" you paid for access with them.
For those familiar with Genshin Impact, you may know about Grasscutter (now called "Anime Game Launcher"). That project allowed players to spawn mobs and items locally. zenless zone zero private server
Currently, a few developers are poking at the ZZZ files, but they are stuck in "PS1 mode" —meaning they can load the city (Sixth Street) and walk around, but: HoYoverse is aggressive
We are likely 1–2 years away from even a basic sandbox mode, assuming the project doesn't get a cease-and-desist letter from HoYoverse’s legal team (famous for shutting down Genshin private server hubs like Shinobi). We are likely 1–2 years away from even
HoYoverse uses advanced anti-cheat software (custom kernel-level driver on PC). If the anti-cheat detects modified server connections, it doesn't just ban your account—it bans your hardware ID (HWID). This means you can never play any HoYoverse game on that PC again, even with a new account.