What makes this a phishing message?
This is a classic 'sextortion' hoax from a random GMail email address.
https://www.bbb.org/article/news-releases/20517-scam-alert-beware-of-sextortion-emails
Tips if Something Seems Off:
The anonymous fraudster is now using leaked home address information to induce more fear in the recipients. The data likely came from a recent data breach, possibly the National Public Data (NPD) data release.