Unlike Nexon, which has a legal obligation to keep servers running (or announce a sunset), private servers are capricious. The admin might get bored, run out of donation money, or receive a cease-and-desist letter. Your character—which you spent 100 hours building—will vanish overnight with zero warning.
: Private servers exist in a legal gray area and are typically not endorsed by the original developers (Nexon/Boolean Games) [5.22, 5.34]. Current Community Status darkness rises private server