> Yes, but if you goal is to hide your identity, this really wouldn't work

It still could.

> Everything is still tagged to your identity, i.e. @mydomain.com.

If your domain is tied to your identity, then yes. But to be extra clear, this should have said "Everything is still tagged to your domain" as not everyone has their domain tied to their identity. I for example have my domain setup njal.la with zero personal details attached to the domain itself, either publicly or at njal.la.

Except now this comment ties your username to that domain ;)

To njal.la? I guess that's fine, I'm not their only user ;)

Maybe not the best idea to provide that info in searchable plaintext tied to an account you own?

Neither my identity here, my domain or my account on njal.la is connected to anything in my real life so not sure why it would be a bad idea?

A comment you made in the past or make in the future could reveal something; simply changing the text to "njal dot la" would prevent a google search of the domain from finding this.