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I guess they don’t disclose it because they change it frequently. If whatever new arm chip became discounted, they just switch to that.
I noticed this a long time ago, Asus did this with their entry level routers frequently, but they at least disclosed it. You had to be careful, the same router with the same name could be totally different inside, only the revision number changed.
It doesn’t help much if your cousins signed up with their real name. If you are male, they can figure out your surname even if no close relative submitted samples: https://en.wikipedia.org/wiki/Surname_DNA_project