Is it wise to use our mobile numbers and personal email IDs in Airdrop websites?
The truth is that I in your position would take it a little more calmly, spreading your number and other personal data on any page that promotes Airdrops is not the wisest thing you could do because stealing such data from a network is not the hardest thing to do.
However I understand your point because sometimes it is the only way to access those offers. However, what I do and I recommend that you do is create an email only to serve as mail in Airdrops and other promotions and with respect to the phone there are also very valid alternatives such as using virtual numbers fully operational or even assign a new number for that sole purpose so as not to compromise so much your personal information.
In any case give or not your number and personal mail the first thing you should do is to thoroughly investigate the platform that offers it airdrop so you can legitimize that it is secure, totally legal and authentic.