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I can at least explain why it's not as arbitrary as it seems. TwentyPercentCooler is going to be absorbed into e621.
See tags dont_transfer and to_keep. When the merge happens, all the human-only images here won't make the migration. That includes the EQG humans. >.<
That actually makes sense now, but oh dear that might make the job rather a bit larger in terms of how much I wanted to back up to avoid losing anything that might be here because it was not suitable for Dbooru.