Yes - I flagged myself as an Optery founder on my first comment, but as you mentioned the comment was subsequently flagged and hidden from view. It is also made clear here: https://news.ycombinator.com/user?id=beyondd
From my perspective, I'd put it in any comment mentioning Optery or criticizing competitors. People often read one comment; they don't read all your comments and your profile.
It also adds some credibility: You actually know what you're talking about in regard to this kind of service.
It also adds some credibility: You actually know what you're talking about in regard to this kind of service.