[wongarsu]

There are also plenty of services that host user content, but only for a short period of time. Pastebin entries with a set expiration could for example set this header to inform clients about the expiration date. That way software can detect links to content that will expire and act accordingly.

[deadwisdom]

Yes, and I think that's the smartness of this is they clearly came from a stance of Deprecation and realized they could make it more general. Good work, imo.