Agreed. They will buy it from you and will sell it OTC with lots of profits. There are lots of telegram groups selling those IDs to anyone who wants to participate ICOs. And that is a best-case scenario. I don't want to think the worse one...
This is the bad side of it, everyone who joins these bounties and airdrops that requires KYC are believing much that their identities are safe and will never be sold to other parties. But that's it, we already known that many of them are doing this for the sake of IDs.
What kind of people who want to share penny money for a KYC. I think people must be smart because of my guess they only buy your personal data to be misused.
You may never know the real reason why some are still blindly following and passing on these KYC requirements, they want to make small money out of it but the possible return on what these people can go wrong with their identities, I think they don't even think about it.