IMO, the UI/UX isn't too bad (not great either). The per-line thing makes sense if you have multiple individuals on the account and want to opt in (I've never heard of such people, just saying). The toggles are straightforward although this is a rank lower in UX compared to the standard email "unsubscribe" pages, IMO. The more egregious thing is this is opt-out instead of opt-in ... probably something we need legislation to solve.