Participating in an airdrop or bounty is, in a way, an investment of time. If we invest anything, we should do a good research of the project and the campaign to which we want to join. It is not easy and not everyone can do it, so if you want to reduce the risk, you should only join campaigns that are managed by experienced and well-known managers, because they will do the research for you.
In this case, it's hard to say anything because we don't know anything about the project, but asking to send any amount to get a reward is always a 100% scam.
Right. Asking money prior to distribution of tokens is already a red flag. Participants should never be the one paying, its the task of the bounty developers. This is mostly the case if you join a project without doing a research on it. Participants should always do a background check first before they start to invest their time and effort. And yes, look for reputable bounty managers as they will never try to ruin their credibility just for a single mistake. Always have time to DYOR. That way, you will have an edge over the bounty.