[mrtesthah]

The Vorbis codec was simply not as good[1] as AAC or Opus which have since superseded it.

1. http://opus-codec.org/comparison/

[nick238]

AAC is proprietary and Opus didn't exist before 2012. Vorbis came out in 2000.

The format for audio files doesn't matter much nowadays, especially with sufficient bandwidth and most people streaming them from whatever service that uses whatever it will. In the era of Napster, those early 2000s, the formats were very front-of-mind.

[Novosell]

I think the developers at all those streaming services might disagree with you about file format not mattering.