There are so many bounty campaign that moderate by newbie with 2/3 activities, is that kind of bounty are safe and believable?
Bounty campaign that moderate by newbie is scam most of the times. But you can participate in the bounties that manages by a group or team. However, if the bounty manager is renowned and the fund is in escrow, the guarantee of payment is higher. Above all, there is no guarantee of receiving payment from the bounty.
Joining in bounties managed by newbies is too risky. It's not that we're doubting newbies' capability but it's the reputation that we should check first. We must always check on the team behind each project. Also, we should double-check the potential of the project of our choice because scam bounties are everywhere. Some of them are just attracting investors but won't pay their participants in the end.