It's very difficult for us to know it's a scam or not.. Maybe one way, I never want to invest with new coins. I always run the free ones when they pay or not, at least I don't lose money, maybe it's just a loss of time.
If you participate in a potential bounty project, you have the opportunity to invest as well because there is no guarantee that you can receive the distribution of bounty tokens on time or even delayed, we can profit from private sales in addition to tokens from bounty payments.