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TIL that 'chumbox' refers to the grid of thumbnail advertisements with "low quality clickbait links and articles"
(en.wikipedia.org)
example from wikipedia:
I specifically remember the style of ad that made me get an adblocker. In the olden days on the og minecraft forum, they had an autoplaying video ad at the bottom of the page. Every single post you clicked on, or new tab you opened, you had to scroll all the way down to mute the stupid fucking ad!