Not a very elaborate thought to understand.
however, as mentioned in another post, it is not clear that 23andme allows sample aggregation and 'pseudonyms'.
other than that, an OK idea.
There are other private sequencing firms, not to mention the original, and IMO still the best, Bryan Sykes
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Quite a bit more expensive ~$400 as I recall, but the other options have...umm...other ways of monetizing their activities.