I suppose you have a point. There are plenty of reputable people out there building strong identities on pseudonyms. But if you’re trying to be truly anonymous, as opposed to pseudononymous, and aren’t tying that identity to anything outside of the one enterprise, that could mean you’re putting less on the line with your reputation. Or it could mean that this is just you starting to build an identity, since everyone has to start somewhere. But either case has the same characteristics common with burner identities, so you’d be justified in being skeptical and cautious.