User
~DefaultTrust created his account 6 days after theymos posted
DefaultTrust changes.
He was probably trying to get on DT2 from accidentally being included but that didn't work:
Prefix a user's name with a tilde (~) if you want to exclude them from your trust network. If you want to trust someone whose name begins with a tilde, prefix their name with a backslash.
I assume this is as it's not possible for anyone to add this user to their trust list, unless I'm mistaken ?