Well-designed software already thinks about what actions in the UI imply endorsement of specific outcomes.

For example, signing a EULA.

But also things like "the user's message in a chat shouldn't be visible to other members in the chat until they hit send".

What if you could capture those implicit policies as explicit endorsements?

The result would be a UX that felt natural and unsurprising but also had formal guarantees even in untrusted contexts.