Not some, a lot of them are scams, but there are also good projects so we should now how to choose good project. here are some tips: https://icoguide.com/en/blog/how-to-identify-scam-icos this article will help newbies to avoid scams.
Most of the ICO's now adays can be a scam, infact there are alot now and sometimes its hard to determine what is a good ICO and not. Even the long time investors here sometimes be a victim,so we better be careful what to choose.