3. Some airdrops send us an email to KYC and follow us to a fake side.
They are only collecting information from their airdroppers and everyone should be warned and aware about that.
Don't be also get fooled if they are asking airdroppers to pay or send a little amount of ETH direct to their address, it's a scam. Airdrops should be free and without payment.
Also don't give them your private keys if they ask to.