There are dips in the curve, so can’t be cumulative.

that’s weak argument - this isn’t calculus class, it is real world data. real world data have inaccuracies, some post might have been deleted or otherwise unaccounted for, or something else might have happened.

pretty sure it is cumulative - 1 million posts per day would be totally absurd number

https://i.imgur.com/xV58cUe.png / https://the-federation.info/platform/73