I don’t see the usefulness of that one compared to just deleting your comment in that scenario. This one will just be abused by trolls posting outrageous claims and then preventing people from replying by flagging the mistake option.

Yeah, it was aptly called thesefuckingaccounts. It did much good work to fight the incessant bot spammers and scammers, although probably just a drop in the ocean in the big picture that has become the cesspool of reddit interaction (mostly with the full compliance of the reddit administration).