I've seen a campaign with a newbie bounty manager is that trustworthy?
Check out the past campaigns that held without any secure and just a newbie account.
Most of those campaigns are running from their participants and they paid nothing to them. If you want to join a campaign, make sure that the manager is trustworthy and if possible the funds are escrowed by someone that has experience and is trusted.
Do you think this campaign can be not a scam?
Most of it are prone to become scam not unless the fund is escrowed.