We are pressing it too hard.
This is a forum. Not a review site nor a scam hunting site or a site who separate wrong from right on the internet.
It is just a forum. Flag, trust score etc are just some features to help the community members. We do not need to care about the entire world wide web ☺️
Guests and visitors are not the entire www. They are users who stumble on the forum or where recommended to go here and are yet to create an account.
I for one usually advice users to browse around as a guest and learn about the forum, read rules, explore the features etc, before registering an account here, that's one reason I would want those users to either have available features to avoid possible scams or their exposure to them be reduced.
Trust score helps only when a user wants to trade with another user. It's visible on reputation, service such type of boards. The flag works the same and it's absolutely fine for me.
The issue with that, is in the highlighted case, trust flag would only be visible on the 1xbit thread, users with the signature will not have any flags or warnings about them promoting a scam project.