Type 3 flag is not about "a scam", it's about a violation of a written contract.
To be fair, the Type 3 flag does trigger this language in the warning that hangs over the user's threads:
One or more bitcointalk.org users have reported that they strongly believe that the creator of this topic is a scammer.
With the implied scam being that referenced in the flag's reference thread.
Don't mean to get all TS on you.