Does anyone have advice on how to distinguish authentic airdrops from scams?
No one can tell. So try to study by yourself project aim and idea to see is that a copy/paste project or just a hype or something bring new developments to crpto world . also try to search what developers and coders say about it don't take only view read more and then nothing to loose by registering in airdrop . and remember some projects will fail in one month time other will continue like a rocket (see the story of XMR ,DCR ,ONION ..etc)
Thank you