If you are going to participate bounties, you need to be very careful. Projects may be risky, but it is ok. In the same time, there are a lot of fake ICOs, so beware!
There are always risks.I have selected projects very carefully,but some of them still haven't paid me.I can imagine the surprise of those who participated in the ico and still have not received their coins.
The best way it to participate on the bounties and a lot of the giveaways that those ICOs companies offer to the public.
It is not always to join in the bounty to earn free tokens but sometimes they organize also the random people to win some tokens or some of their services for free.