I'd almost guarantee the original TOS had a line like "we can change the TOS at any time."

Having said that, I also thought I'd seen quite some time ago that burying undesirable restrictions in the fine print of a TOS doesn't help companies who fuck up as much as they hope it will in court because it's been acknowledged that so few people thoroughly read them.

IIRC they scare people into thinking they have signed away legal rights more than they actually have. I could be wrong, but that's my recollection.

Edit: Just a quick search - https://www.rocketlawyer.com/family-and-personal/personal-finance/consumer-protection/legal-guide/your-rights-if-a-business-changes-its-terms-of-service

Consumer protection laws

Federal law and many state laws protect consumers from a wide range of deceptive, fraudulent, or unfair business practices. As mentioned earlier, businesses can enforce their TOS even if their users did not read them in their entirety, but only if the terms are reasonable and fair. Hiding unusual terms deep in the fine print of the TOS could be considered deceptive.

Maybe not but you’ll undoubtedly have to go to court to argue that (paying legal cost the whole time) before you can then start the case about gross negligence (and pay more for)

It’s all designed to ensure you can’t afford to sue them

Yes, but every other "oopsies" that will happen to your DNA Data will cost them a "We're so Sorry"-Card and a Hershey's Kiss per Customer. And there will be oopsies in the future. It was a way to voluntary get people to submit their DNA Data with the Bogus claim to "find out where your came from". But the value for the medicine (read: Pharma industry) is much much bigger. My Sister submitted her DNA to them. They now know the genetic probability of illnesses of my whole Family-Tree including mine and everyone else in the Family up and down. And not only they know, but everyone who is using the "leaked" Data. Thank you Sister.

I would be surprised if they thought that far ahead.