Moved to bcc

Just came across an interesting mail technique called “moved to bcc”. Here’s how it works

1. You introduce me to a friend of yours and finish off with some variation of “okay, have fun!”
2. I want to thank you for connecting us but not keep you on for the details.
3. Instead of cc’ing you, I bcc you and say “Thanks! (moved you to bcc)”.
4. You get the thank you message.
5. When your friend replies to me so we can get to talking, you’re gracefully freed from the thread.