So is it because Crota the spoiled scrub brat son of Oryx failed on meen that wr don't see any Taken over there or is it some deep lore? Sorry I couldn't find any reference to the logic of sparing Moon from Taken anomaly so asking this question.
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I'm sure on the first moon mission the ghost says something like 'we gave up the moon to keep the hive away'. No need for the taken to try and cause havoc on the moon as it already belongs to them. Maybe that's why??