And even that is limited to iOS, macOS Safari does support Vorbis (with some limitations). It is so widely supported that you would consider a JS decoder for the iOS polyfill.
But why not choose a format that every device supports that is also non-proprietary?
MP3 was proprietary when they started. The Vorbis polyfill works. Probably many files do not have a higher quality copy to encode.
Wikimedia commons recommends Ogg Opus over Vorbis these days
Wikipedia has, rightfully imo, chosen to use an open format. My browser plays it just fine.
RTFA. MP3 has been a free format for over 6 years.
Does every desktop Linux distro include MP3 support in the base system? How many of the audio files on Wikipedia are older than 6 years old?
Linux users are self-selecting. Wikipedia is an encyclopedia for everyone, not tech enthusiasts who decide to pick software that doesn't support an extremely common, non-propriety (!!!!!!) file format.
Ogg Vorbis kicks ass. the 320k ogg that spotify uses are top notch