The email in question appeared to be from Trezor, and claimed that users' funds were in jeopardy. It prompted them to download a new (fake) version of the Trezor wallet software, and when users entered their seed phrase to restore their wallet from a backup, it drained their crypto. "What a mug I am," wrote the affected user. "Had been building up my BTC for seven years and lost it in a few minutes' utter stupidity."
The Reddit post also included two follow-up edits, displaying the victim blaming that is common when users are hit with phishing scams and other attacks. The user wrote "Edit: yes I entered my keys, because I'm a twat Edit 2: a lot of people saying they'd never fall for it. I hope they're right."