I have seen evidence of some scams being run under the guise of KYC in order to gain your passport and government issued id's. Be careful out there and remember that a lot of these coins end up being scams. Do you really want them having your passport/photo identification? This is how people fall victim of identity fraud so please think before sending your information in.
You need to be very careful when choosing a project where KYC is required. Especially if you are involved in bounty or in airdrops, it can be very dangerous.
It is obvious that you have to choose projects with KYC very carefully. A greater threat is how personal data can be used. Because we do not really know who this data is sent to and how it will be secured. With a large number of campaign participants, a large personal database is created that can be sold to third parties.