"their own reasons" could very well be any of the following: - It is necessary to upload a gpg public key to a keyserver in order to publish packages in some p

"their own reasons" could very well be any of the following: - It is necessary to upload a gpg public key to a keyserver in order to publish packages in some public repositories, such as maven central, or one of several linux distribution repositories - They needed it in order to send or receive email from an entity that required using PGP, but don't use it normally. - They tried using PGP for email, found out how painful it was to use, then decided it wasn't worth the effort and stopped.