I mean that’s literally how it works. You pronounced the peanut butter with a soft J. You probably pronounce Lyft as Lift and JoS A Bank as Joseph A Bank. What a company chooses to name its product (gif was a product trying to be sold to software devs) they can choose however they want it to be pronounced. If you stop thinking of gif as a normal word and more as a product that was and continues to be sold then it makes a lot more sense why they literally gave it a catchphrase; “choosy developers choose gif”