In an email sent to customers earlier this week viewed by Engadget, the company announced that it had made updates to the “Dispute Resolution and Arbitration section” of its terms of service that would prevent customers from filing class action lawsuits.
Olnly if you opt out of the new terms, at least in us.IANAL of course
In much of Europe, at least in EU, ToS cannot take away legal rights.
in order for a ToS to be legally enforcable, the user has to see it. A user cannot give consent on an agreement they did not see, therefor in court it would be 23andMes job to verify that the user was indeed aware of the ToS and acted accordingly. they could not say everyone ops in and defend themselves that way by default because not everyone that was forcibly opted in gave an agreement to the new ToS.
You can still sue. Whether or not the suit goes through is different story.