Take a step back and look at the entire forest: The outrage is over an app accessing data specifically designed to be shared across applications. That's what Copy fundamentally means- make this thing globally available to all my programs. You can poll pbpaste/xsel in your terminal and generate a log of the clipboard buffer without any privileges. Does this mean an untrustworthy app could, in theory, snoop your plaintext password copied from a password manager? Sure, but that's a separate discussion.
Ask yourself, does it make sense to implement clipboard snooping in a way that polls the pasteboard on every keystroke while an input form remains in focus? No, that's weird, there's obvious bug stench. LinkedIn may be nefarious, but defaulting to instant outrage and lack of critical thinking is the real concern here.