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.