sticky notes
Yes. That's literally what it says on the trust page: "Other comments."
Granted a note saying that you're on someone's ignore list seems meaningless without explanation but it's a neutral... who cares.
Logically, it's not intended to be used as a sticky note and if everyone or mostly DTs use it around as a note than user's trust wall's here would be one of the rarely visited pages due to extrem amount of BS. Also there are more better option to add a note to a person with other 3rd party applications, as anyone assigning or noting it doesn't need to make it that public.
You can vote against it with "~".