I was just looking at https://haveibeenpwned.com/ and it listed appen as a site that breached my details. I had no idea who they were or why they had my details. I guess this is related?

Appen: In June 2020, the AI training data company Appen suffered a data breach exposing the details of almost 5.9 million users which were subsequently sold online. Included in the breach were names, email addresses and passwords stored as bcrypt hashes. Some records also contained phone numbers, employers and IP addresses. The data was provided to HIBP by dehashed.com.