Why does a weekly email from Flickr arrive a little later each year?

Post date: 2019-06-18 00:27:46
Views: 707
I've had a Flickr account in gadzoinks, probably since 2005 or 6. One thing I've noticed is that during that through the years the "new posts from friends" email has slowly drifted from arriving on Thursday, to Friday, Saturday, Sunday and now comes on Monday. Does anyone happen to know why that's happened? As in, what programming choice, or variable, has led to this slow drift.
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