For me, it’s that I can make email addresses that are not able to be identified/associated with each other. Meaning alias1@yourcustomdomain.com and alias2@yourcustomdomain.com are clearly both the same identity. It’s a fingerprint. This may not be one of your privacy concerns.






My aliasing service provides multiple domains to chose from whenever I create a new address. I try to mix them up but no, there aren’t enough to have a different one for every single service. But together with the fact that I’m not the only user they have using those domains, I feel there’s enough obscurity.