One easy way to spot them is that they don't have very much information about team or that they have whitepaper on roadmap after ICO sale. Whitepaper is the most time consuming job to finish. so always make sure
there is a good whitepaper before the ICO at least. that makes the investment some what safer. Master node coins also seams to be very popular with scammers. Don't buy MN or Private sale before whitepaper at-least
it makes it harder for scammers. Only reason why people scam now is cuss they see the profits in scamming uneducated people in the crypto world, specially the new people.