Agreed, its like a new level of scam and it happened in a few months ago when airdrop campaign was hot. There are a lots of them asking for donation for 0,1 or 0,01 eth the reason is simple to filter multiple account however i believe if there are multiple account joining a campaign then that is their problem to filter it out and they must already know how to handle it before asking us to help them and for the record 0,1 eth is still a lot for just filtering an account and imagine if there are 1k people or more donate to them. Its free money  

By the way, when you mention certain "someone" just called you from that bounty then is it the manager handling the bounty? Or its just a certain nobody?

Yeah, I've seen those schemes before. They ask for an airdrop and to take part in they ask for 'simple donation" but then it's not an airdrop. Same with that bounty they are finding ways to not pay you, moreover many people don't read the rules and will do the bounty campaign anyway providing them with free marketing.

Let that one pass, don't stress yourself over it.

It does not mean that if they are asking you 0.1 eth and they are asking you to sort out users with multiple accounts they are already scammers. But even though they are not scammers it is a foolishness to ask somebody who is not a part of their team to do that job for them. If they will give you a salary then it is okay but if it is for free then that is very unprofessional.

Guys it's really sad how these scammers evolve. They even try to rip off the bounty participants with eth and free marketing. I really wonder when these kind of scams get busted.