Well it depends... I don't really think that every project with anonymous team is a scam. Look at Bitcoin, the person who is behind it is unknown. Can we call Bitcoin a scam?
Not at all, they are just not putting there names in ICO, just to prevent there IP and personal information about because they are highly investors that having a lot of income. If they are able to put then they are in risk for those scammers so I think it's normal for them to have privacy .