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23andMe Terms of Service Update | Hacker News
(news.ycombinator.com)
This is a most excellent place for technology news and articles.
True, but somehow you need a way to know who accept the new terms and who don't. And you need to know the point in time from which you can start to enforce the new terms. As @bob_lemon said, it could be that the default is a "no" but you need to give a time limit.
Where I live the concept of "silent consent" is used in many other occasions and does not seems to be a problem.