We searched Nature papers published in January–April 2014 that contained at least one image requiring colour discrimination: roughly three-quarters used a red–green combination.
Some journals now recommend that authors recolour their figures — green and magenta, say (see, for example, ).
Please, don’t guffaw yet, Zuckerberg’s design gesture was neither a personal twist nor mere eccentricity.
He was simply designing for the widest possible audience.
With ‘UI Colorblind Mode’ enabled, the game will add the words “Rare” and “Epic” to the tooltips for those items.