This can be good for reputation, but bounties managed by popular manager gives it the spotlight. but the payment will be lower as usual because of the amount of people who joined the bounty. But there's no problem on joining their bounties it looks like that their bounties are quality ones, And because it is managed by a manager this means that distribution will happen. which is good.
Yes, because of their good reputation, I decided to take part in the ARCS campaign that they hold, and for the ARCS signature campaign the form has also been closed by the manager, the point is to avoid the entry of new participants, generally I see there are several campaigns good bounty detective like, ARCS, HOMT, and EZY, besides that I haven't checked it.