So many ICO now appeared different, if you can guess you can got your Lamba, eventually decided to invest in Credits, the project has a new interesting consensus algorithm, I think it can really provide the declared speed, the idea is not devoid of logic. Let's see how he behaves when he goes to the exchange, but the beginning is good.
Well, you don't have to guess, you just have to do your research. There are certain pointers, that can be verified in a matter of minutes to check out if the ICO is scam or not.
1. Check out the website (if it's a crappy website, with images that don't have a place in the design, it's scam most likely)
2. The whitepaper spellcheck (if the whitepaper has A LOT of mistakes, it's probably scam)
3. Team check (if the team is not displayed or if the team is displayed but doesn't have links to facebook/linkedin profiles, mostlikely is fake)
4. Google "ICO name + scam" see what you get on google
5. Check what other ICO rating websites think about that ico
6. Check what other blockchain expert think about the ICO
7. If everyhing is good, buy some tokens.