It was one of the points that could be considered a red flag, that's correct. But that doesn't mean that every project with an anonymous team is automatically a scam.

It's hard to come up with rules that would unambiguously identify a scam, so the points I talked about earlier are meant as indicators that should prime you to be sceptical but that doesn't mean that something is definitely a scam (even if it ticks all the previous points)
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence