Did he also invent grammar? You don't see the irony of the text? It's not pronounced "gif", but that's...exactly what the acronym stands for? Unless someone changed the word to jraphical at some point. So it should be pronounced that way, not "jif".Not that I have the opportunity to say "gif" outloud on a daily basis, but I would still pronounce it that way.
of course you also spell out "generous" with a "g" and not with a "j", amIrite? And giant. And ginger. And Germany. And....
He invented the format, people were arguing about how it´s spelled. So when he says "you spell it with "j"" then it is spelled with "j" because he invented it and has any right to say so.
Also, with that, this old and
useless "how to spell gif"-discussion finally has an end. Everbody who still wants to spell it with "g" can do so (not pointing at you lizard, I mean people in general, I´ve got some people around me who still bring up this old, useless discussion. You have no idea how many full-bearded hipster web designers vienna can hold, ugh...), but if somebody now says that it should be spelled with "g" can go fuck a dustbin because he/she is officially wrong now, not even grammar can help him/her with that.