Why is there no option to upload in OGG format?

Seeing that OGG is open source, and alonetone too, i just don’t get it
Is it because it’s less popular than mp3 or is it a more technical reason?

The main reason is OGG isn’t supported by all browsers (and we present the uploaded file as-is to browsers, no transcoding )

OK now i understand
plus not even all (relevant) media players and other programs using audio support it