8- KYC issue: I prefer not to do KYC for airdrops or bounties. If their database gets hacked, your passport can end up in Dark web. For exchanges, I always try to use my Driving License instead of my passport for KYC (some of them only accepts passport :/ )
9- For airdrops I use another email. Don't want my original email get spam mails and I want my exchange email to be safe.
I think better submit an ID like a postal or any ID that can be expired within 1 year or 2 years. Using a passport or driver's license is not a good idea both of these have 5 years or 10 yrs expiration date.
Or better stop hunting airdrops bounties because most of them are scam and usually asks for KYC unlike before you can get them without submitting any documents.