[...]There is no any another MMO-roguelike game[...]
You seem to forget that TomeNET is based on PernMAngband--multiplayer PernAngband--itself basd on MAngband, which has other forks the last few years besides TomeNET (PWMAngband?)
There are/were also three multiplayer NetHacks: InterHack (discontinued, but code is still out there,) and two named HackNet, one of which may not work on current-day computers (without running 32-bit programs,) and the other that just keeps asking you to enter character name. But, InterHack worked, just didn't have many people running servers.