Okay then what? Unless the devs try real hard to stay hidden, Nintendo's lawyers will do a little bit of digging, they will find out who those pseudonyms are, and sue again. And this time the devs will be extremely lucky if they can get away with just paying out 2.4m because the law generally does not appreciate it very much when you try to ignore and avoid its previous rulings. A console emulator is absolutely not worth the potentially devastating legal consequences.
The answers are "the court system" and "have the police arrest them for defying a court order" respectively.
Can't they just create pseudonyms?
Okay then what? Unless the devs try real hard to stay hidden, Nintendo's lawyers will do a little bit of digging, they will find out who those pseudonyms are, and sue again. And this time the devs will be extremely lucky if they can get away with just paying out 2.4m because the law generally does not appreciate it very much when you try to ignore and avoid its previous rulings. A console emulator is absolutely not worth the potentially devastating legal consequences.