Plus, if data will be sold at market rate 5-10 USD, whilst and ICO can aim at producing even 10-20 millions, selling data won't be more remunerative...
What advantage your are referring to?? I don't see any advantage in your opinion. can you please point it out?
However, there are some campaign managers that change their mind and did not require the bounty participants anymore to go through KYC process but will just directly send the shares to their wallet. It would be case to case basis then but later on, maybe all ICOs would require their participant to go through KYC process.
Signing up to their website is OK, but asking for the KYC data after the end of ICO, is not OK and I believe it is a non-professional behavior. If an ICO would require their bounty hunters to submit their KYC, they need to be upfront. I still haven't came across any such instances where the bounty reward is denied due to the requirement of KYC data, but if it happens, they need to be tagged. Can you point me out to a list of ICOs those who are following these malpractice or even some reference?