[Spivak]

How does allowing you to delete your messages jive with the UX of other users?

If every user you sent a message to had a copy of your message would you expect those to be deleted as well? Isn't that the recipient's data?

Assuming you answered no is there a material difference when you store a single copy and do reference counting?

Discord's UI might be lacking but allowing you to delete messages authored by you but ownwed by another is already pretty privacy oriented.