This is good and makes it easy to find some bounty to participate but I would rather stick to few particular bounty managers who are trusted and bring to table some good bounty campaigns from prospective ICOs...
In case of bounty sites I'd suggest Bountyhive and bountysuite.
Yep, this is one of the strength of this website, for bounty hunters its going to be easy to look at what bounties he/she wanted to join. Its still up to us to do our due diligence and research those bounties before joining.
However, a trusted manager is not a good indication that the campaigns is not a scam. I know that there's a lot of debate around the community whether manager should be held accountable for scam ICO's. But for me manager should at least check the ICO before accepting because a potential scam project really does hurt their reputation, in my opinion.