Difficulty spikes

Can someone explain why the difficulty still goes through spikes cycles? Is this because of NiceHash or maybe the exploit mentioned in this reddit post ? :

/Electroneum/comments/8v308m/as_if_the_diff_swings_werent_bad_enough_now_some/

Thanks!

Thank you for the answer ; the variance seemed bigger on electroneum101 (ex. august 27th to 29th - almost 22%):
image

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