Would you release a normal bounty such as signature campaign or social bounty which promotes your platform without any usage of downloading app? It isnt recommended to use app since it could br source of any malware or virus. I'm not saying the campaign isnt legit but this kind of campaign isnt effective IMO.
This bounty/airdrop might still meet some restrictions because it shall require KYC and bounty hunters are tired of campaign that needs their official document without an assurance of worthy payment.
More people will show interest if they can remove the KYC request.