Every time the s.id link leads to a page that says "Link Expired", then the s.id link is no longer accessible because the time previously set by the link owner has expired.

A protected link is a kind of link that can be given a secret key/passphrase before being redirected to the original link

An expired link is a link whose access period has expired. when the link has expired, then the link will no longer accessible

A timed link is a type of link that only lasts for a certain period. if the specified time is up, then the link will expire and can no longer be accessed.