As someone living in the EU, these kind of things puzzle me a lot.
How can a legal system exist, where it's possible to deny a (consumer) contract party access to the legal system and law of the land?
(In the EU we do have arbitrations clauses, but they are only legal between businesses and tightly regulated. Arbitration "courts" must be neutral. And you can not put them into ToS.)
Also, I was under the impression that all sane legal systems on this planet are based on the broad principle of "pacta sunt servanda" = "agreements must be kept". One party of a contract never can change the contract without consent from the other party.
We do have the concept of "silent approval" for consumers over here, too, but that only applies to minor changes to terms that are not a "surprising" change to the consumer. It recently was ruled that for example Netflix increasing prices without active consent is not legal in the EU. There is not much that is not regarded as "surprising" by courts here. "You are not allowed to sue us after having lost your personal data, then lying about it" clearly would be regarded as surprising.
Im summary: Every aspect of that whole 23andMe story would be impossible in the EU. The amount of data they collected, the way they stored it, the way they tried to hide the breach, and them trying to prevent their customers to get access to the law.
I wonder how on earth the US legal system could deteriorate so much that such a story becomes possible.
[Disclaimer: I am not bragging about living in the EU. I did not have any influence on my place of birth. I do not wish to imply that the EU is "superior" to the US. I am just trying to give an outside perspective.]