I have some tips to checking scam airdrop, here my tips:
1. Look thread starter reputation/rank, it's easy to look at Bitc**talk, when newbie creating ann/airdrop with newbie rank, sure 90% is just scam.
2. I take look on their social media, when account create, how many followers( but this not valid since you can buy followers).
3. Checking official website on google, if created only few month and expired in 1-2 year, I will give it as red flag.
4. Website content, if you found many miss spelling, I think that content build in short time by freelancer.
Let me know if you have any others tips, good luck
