there are a lot of ways for making money one method is to steal other people's identity and documents and sell it on the dark market. these ICOs are currently gathering cryptocurrency users information and creating a database from them which then they will sell elsewhere and make some money from doing so.
Can you provide a link so that we would be aware of this modus. Usually i join bounty and they ask for KYC to get the bounty tokens so i am obliged to do so. If only i am aware of this scam i would not give up my identity.