The only real reason I use unique email addresses is to handle spam from services I signed up to, and discover data breaches of my own email. 1) Companies that

The only real reason I use unique email addresses is to handle spam from services I signed up to, and discover data breaches of my own email. 1) Companies that conveniently forget that you opted out of marketing emails every 9 months or so, now I can blacklist them. 2) Twice now has a service had a data breach and I've only found out because I've received spam to the unique email