Serious question. I thought it may have to do with the hive being on the moon but there's not just hive I the moon do why no taken??
Edit: patrols
However this question was answered. It is due to the fact that the hive run the moon, the taken being vessels of the hive god Orxy. He didn't need to infest an area he controls.
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Thank goodness! Bastards mess up my bounty progress every time they spawn on every other planet!