It was in the announcement, too. I’m 99% sure they edited it after they changed their mind, because I knew about it from reading that, and never opened the model card.

I wasn't buried, it was on the third page after the ToC

Yes, I actually do mean that. I skimmed the system card. Them stating it openly, doing it, and being called out on it just doesn't have any meaningful difference.

They could have simply told people "we do not permit using Claude models to perform frontier AI research," which is defensible from a policy point of view. This particular usage of their products requires no deception, nor hiding information prevent abuse.

However, instead, they chose for some reason to publicly display a morally poor way to execute a reasonable business decision (preventing abuse, defending your business interests, etc.)