I agree with your opinion that there are many Airdop campaigns whose purpose is to get information from people. To avoid leaking personal information, you must select good project management teams. My experience is to select reputable bounty and airdrop management groups on this bitcointalk forum as Bounty Detective. I earn some money doing campaigns from this group. I hope there are many reputable airdrop project management groups on this forum to contribute to creating a transparent and safe cryptocurrency market for all investors.
always take care of your important documents, don't let others misuse them in their interests, many airdrops outside of me require you to fill in personal data, even ask for an ID card or SIM, and some even ask for a passport with your photo, it's very dangerous in my opinion