If I were you, I'll join bounty campaign with one account no more than that. But, pick/choose the bounty campaign with potential to gain a lot of profit. Here is who can be differentiate among good bounty hunter and bounty hunter who just spread up their alt account to join bounty campaign.

Their focus just bounty campaign, distribution stake and how long the bounty will end. But, when you just focus with one account you will choose bounty carefully and pay attention many aspects before you fill the form. Regarding to your question, maybe there are several bounty manager who will accept you. But I doubt, with the project that being promoted will end up in legit because good project will choose their participant correctly.