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Antonia herself is licensed under the CC3 license; this is a public domain license rather than an open-source license, and is thus less restrictive...

Less restrictive to who? The merchant perhaps, but certainly not the end-user. After all, any derivatives are easily locked-down.

I contend that the GPL is why Linux is still a powerhouse (and the most open) among FLOSS solutions, and will continue to be so. 

 

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Quote - Counterexample: OSX is build upon BSD kernel and, market share wise, it is much more successful than all Linux distributions added together.

Money-wise, sure it is - marketshare-wise, it is decidedly not. You also forget... Apple was (and is) a marketing and technological force well beyond the Antonia team's abilities (and resources), and has been for decades now.

Quote - CC3 license is for data nearly the exact equivalent of what BSD license is for code.

 

So why not use the BSD license?