if you can know, what bounty project are you following? try we can see from the number of investors or roadmap it, from there seen if ico is able to achieve the target, ico can be believed and not scam, most ico scam that ico who did not reach the target
In my own opinion, you cannot determine if the ico is a scam or not so you should conduct a research before investing or joining their bounties in order to avoid fraud projects.
If you are wanting to see what coin is doing what look at their linkedin and read their social media updates.