My best guess is that it's the weekly limit on auto votes - the spikes are when more accounts are voting on everything, the dips when most accounts have reached their 4/5/6/7/ whatever the weekly limit is on their votes.

When the 'peak weekly limit' is over, it kicks back up again.

i guess if we get more users who set their AVs at different times, so there's more variation in when the weekly cycle starts you'd see less pronounced dips and troughs.

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