What happens to a shared vault if the person who shared it stops sharing?

What happens to a vault of items being shared between two people if the vault's owner should suddenly stop using 1Password for Families? (in the case of stroke, death, cognitive decline, switch to a competitor, change from family to personal plan, etc.) What if the owner or their heirs don't know how or want to continue with 1Password after payments cease? If the owner or its heirs decide to close out the 1Password account and request data to be removed, are other vault participants notified with an advance directive?

I tried searching the forum for the answer, but didn't find what I was looking for. Sorry to be macabre, but I'm always thinking about contingency plans, rights of survivorship, digital legacy, etc.

As a real-world scenario example, I share a vault with a friend for the purposes of managing a shared project. My friend owns the vault and has shared it with me from their 1Password for Families account. I'm wondering what is the protocol for retaining or taking ownership of the items in that shared vault should my friend no longer be able to administrate their family account?