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In most jurisdictions this project wouldn’t have any problem, when it’s a “clean room” implementation - meaning they figured out by themselves how the server works.
Several jurisdictions even allow reverse engineering and such to ensure compatibility / supporting an product that hasn’t any official support anymore.
Others simply don’t care.
It’s all in the details, but they might not get sued that easily.
Killing for yourself: Government will track you down, kick your door in and throw you in prison and maybe send you into the death row.
Killing for your government: Government will provide training, shelter, equipment, pay you and award you medals.