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So they have like 8 EU servers and 8 US servers. Im not exactly sure the number but its just a guess. Out of those 16 servers, about half of them are heavy populated in prime time. They say that servers hold around 5k players. So 5k x 8 = 40k players. Lets throw in another 10-20k for the other low populated servers and you have around 60k players.
Does this sound right?
The reason for this post is because there is no way this game has 500k players playing it.