Realistically, scholars believe the forbidden fruit referred to is a pomegranate- because geographically it makes more sense. Apples originally come from the region around Kazakhstan- much further East than where the garden of Eden was supposedly located.
Some people also think it was a fig. Ultimately the way it was originally written, it's impossible to know for sure but it's unlikely that it was an apple.
I don't know about the choice for logo and intent behind the symbol, but I find the geographic origins of plants interesting.