As a bounty hunter and a fellow forum user this concerns me. Giving personal details to anyone on the internet is VERY DANGEROUS in today's era we can't live without using technologies including online banking, etc...
but the safest way is not to send any information of yourself on the internet.
I think cheaters in bounty campaigns is a big concern today and there is no more effective way to prevent this, than required KYC procedure. I'm not a supporter of it, because there are still many SCAMs aimed at gathering users data, so people need to be very careful with it.