Have you guys informed the same to their campaign manager? Also, correct me if I'm wrong but don't you have to be a Junior member and above to join a bounty campaign? Any campaign that allows newbies to join the campaign will have flooding of alt-account and cheating. You are doing a good job busting them but if you look at the bigger picture, these accounts have not much to lose, just takes them seconds to create a new one and join the campaigns again.
Yes, I have reported this to bounty manager on telegram group, but haven't seen their response in bounty spreadsheet, the account still seems to be approved, whether they are busy or not. The manager is their own team I guess, project also looks bad, because main channel is filled with conversations about bounties.
Yes at least he does not get results of what he is doing now or before, if there is anyone who helps report to the relevant bounty. And I will link all of his related social media accounts here.