I think the best way to avoid all these scam airdrops is just by joining airdrops related to popular projects. Coinmarketcap educational program called "EARN" is one of the best airdrops and they do sent rewards to your binance account.Yeah, we never know which is legit and scams, it's kind of tiring to keep joining Airdrops because almost all of them are scam but when you unexpectedly joined a legit Airdrop it makes me feel like joining more of them because i might get lucky again