So, I'm a strong yes.

Every ActivityPub post has a `replies` collection that contains all the replies to the post. The definitive version lives on the original poster's server.

The OP should be able to either approve replies before they're added to this collection, or remove them from the collection if they're added automatically.

@evan completely agree, only thing that gets tricky is how to deal with a _grandchild_ reply that you want to remove without removing that _child_ and the other grandchildren.

let's say B replies to A, and C replies to B (let's say all separate servers) - the only way for A to remove a C is to remove B, being the only replies collection it controls.

only solution I see is materializing the entire tree in A's replies collection (using AP's rich object model) which most implementations don't do