This person stored their PGP private key on Google Drive, which they use "to encrypt" emails. I'm glad the author is security-conscious enough to know what PGP is, I guess. And that they deleted it from Drive (didn't say why, hopefully they came to their senses about the more-than-usual amount of trust they were placing in Google).

Is there a valid use case for "encrypting" email with a private key? I guess signing a message is technically encryption, but it's not typically called that, right? I'm hoping their use of "encrypt" in this context is just an error, and that tech reporters at the Guardian understand how key pairs work...