The following are some of the easiest way to figure out a scam airdrop
1. They will ask you to donate
2. They will ask for your private key
Feel free to add yours in case there are many more.
Best regards and happy airdrop chase.
HERE ARE SOME BIG ONES!
They don't link to a website on the google doc.
They have no website to link to.
They use images they found in google for social media profile pics.
They misspell every other word in their airdrop form.
They forget to ask you for your eth address to send the airdrop to.