Well I can't say for all though, but someone who is elite in the crypto space and understands how important their keys are, they won't be so stupid in sharing it to an email no matter where it's coming from.. the phishing scheme is becoming something else especially with emails.. fact is a good number of people still falls victims to this and the best way to prevent this from happening is to let them know that such things actually exist. I'm happy that trezor shared this as well..but shows how reputable they are and would be in the future....