Who cares whether or not they received the standard amount of due diligence/vetting? The only reason a system like that can work is if participants act in good faith, and this company obviously didn't.
edit: Like I said, I'm not exactly knowledgeable about the world of tech startups. If i've learned anything though, it's that the money being given to obvious scam artists being excused as "vetting batch investments doesn't scale" has made me even more depressed and cynical about tech startups than I previously thought was possible.