Oh! Thank you!

That popup was confusing as hell then, because I've read and understood it as two separate points: I've got it that they're making training opt-out, and that they're changing data retention to 5 years, independent of each other. I got upset over this, and haven't really researched into the nuances - and turns out I've got it all wrong.

Appreciate your comment, it's really helpful!

I hope they change the language to make it clear 5 years only applies to the chats they're allowed to train models on.

(Weirdly, I can't find the word "years" anywhere on their Privacy Policy, and the only instance on the Consumer Terms of Service pages is about being of legal age over 18 years old.)