[CaptainNegative]

In principle, someone seeing [e-mail], [e-mail], and [e-mail] in a dump might be able to infer that all of these belong to the same user with a catchall address (especially if they can verify that the domain is unpopular via dns caching or other tricks). Using a common service adds another partial layer of anonymity between the email addresses, making one harder to track.

[ziml77]

Especially necessary when your domain is your full name. It's painfully obvious that all addresses under the domain belong to a single person. I've been using Fastmail's masked email service for a while to hide my personal domain. And before that I had a handful of gmail addresses that I set to forward to my main address.

[Ringz]

Theoretical yes. But never had that. It is more likely that generic, non existant emails like [e-mail], [e-mail], etc. will be generated if you have a domain with a public website.