User Velkro and their private key stealing vanity generation site BitcoinVanityGen (.) com <-- SCAM has caused significant financial harm to many people when he stole their coins. No one wants to see a repeat of this and thus anyone offering such a service can be considered high risk, making TryNinja's trust feedback valid. "You think that trading with this person is high-risk."

The user also told people to trust him when announcing the service. People are making a big deal because you could be preying on those new to Bitcoin who wouldn't know how to use split key or the risks of having you generate a vanity address for them.