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23andMe frantically changed its terms of service to prevent hacked customers from suing
(www.engadget.com)
This is a most excellent place for technology news and articles.
Like all good lawyer answers: maybe. I don’t know enough about the specific amended terms or their data breach. Courts sometimes enforce adhesion contacts and sometimes don’t. But retroactive in and of itself isn’t illegal; for example, if you could edit NOT retroactively settle a dispute, you’d have no settlement agreements.
But settling a dispute requires compensation for the party that was damaged. That's what a settlement is.
You can't say "If you don't do A, B, and C you can't sue me! Nah nah nah!" Without compensation courts are not going to believe that anyone knowingly agreed to the settlement.
Now if they gave everyone like $5 and said "Sign here where it says you can't sue," that would be different.
You’re referring to the contract concept of “consideration” which sometimes is the same as compensation but can also do doing/ not doing an action. Sometimes consideration isn’t required either, particularly if the original contract had adequate consideration and says future amendments don’t have to have it. (Depends a lot on which state). That may or may not matter here. It really depends on the specific terms at dispute and you can’t just assume it fixes this issue.