That just means that Apple manages this list:
http://www.mp4ra.org/atoms.htmlThe file format is still an ISO standard and pretty much anything reads it. Even Apple itself doesn't use the Quicktime container anymore (and hasn't for years). I didn't insinuate anything regarding open source, which doesn't appear anywhere in the part I quoted.
Edit: Oh, I noticed you significantly modified your first comment, that's why you now talk about open source when I never did. When I responded your comment read: “From the guy that tried to force QuickTime on us?”.