4. Bounty managed by Newbie is big red flag, it's risky to join it. But even trusted manager isn't guarantee that you will get paid. Sometimes payments for bounty are issued by ICO team, not by manager, so risk to be scammed still remains.
I'd say you need to also look at which project that do that. I've personally known a bounty manager who manages multiple projects creates a new account for each project that she manages (well, to be precise, Copper Member). But if the project is really weak/without any prospect, it's very likely the bounty will only waste hunters' time.