I don't think that argument is easy to defend, considering how big the internet is and that this is just a copy of existing ideas that have been done before.
Context matters. This is Reddit, so that particular effort will become a part of remembered Internet history for the next decade or more.
Re:Reddit’s April Fools’ experiment
by flying_kangaroo on Tuesday April 04, 2017 @01:00PM
(#14034856)
On the flip side, however, reddit is (as of today on Alexa) the 4th most visited site in the US. Given that user-base, I think a lot of internet users have noticed this.
To be fair, it is arguable that it deserved attention, as the final picture is now a part of internet history.