CPU Usage Differences After Applying Meltdown Patch at Epic Games
The Meltdown attack requires an attacker to have a piece of code executed on your server. Epic's servers are used for login, where people send you data, and for game logic, where people also just send you data like "player x moved his avatar here, player y shoots etc". If all the server does is execute the code which Epic wrote themselves and already  trust, why would it need to apply the Meltdown patch?