How did Apple get all of my email addresses?

from blog The Desolation of Blog, | ↗ original
For software testing purposes, I use a Mac mini with four APFS boot volumes, one each for Big Sur, Monterey, Ventura, and Sonoma. These were all "fresh" macOS installs with no upgrades or data migration. For the most part, the Mac mini contains very little of my personal data. I do sign in with my Apple ID, but that's it. I never receive, read,...