This is called ephemeral messaging. A good feature of many apps. But doesn’t serve the same purpose for which I am asking. Thanks for mentioning another option other than the usual messenger apps. This is the description for others copied from a basic browser search.
Keybase is a key directory that maps social media identities to encryption keys (including, but not limited to PGP keys) in a publicly auditable manner. Additionally it offers an end-to-end encrypted chat and cloud storage system, called Keybase Chat and the Keybase Filesystem respectively.
Website here for those interested in reading about it -> keybase.io