Personally , I don't think there should be an ICO without whitepaper. The whitepaper bridges the gap between an investor and a company. Can we say a ICO without a whitepaper is a scam? Or what can you say about an ICO without whitepaper
You can't just claim it to be a scam however who would invest in a project who has not even taken the time to write a proper whitepaper. The lack of whitepaper is much more revealing about the project than just a lack of a white paper (if you know what I mean). I would run from this very fast.