- Someone can steal your coins if u give up private keys, which some fishy sites ask for.

- Suspicious wallets can contain mallware

- Someone can steal your information (email, twitter, bitcointalk ID) and apply for all airdrops using their own eth address.

On most Twitter / Telegram groups people are mostly spamming referral links, its really annoying to scroll through all that.
I like the twitter of cryptoairdrops and airdropalert twitter, en also https://airdropalert.com/ . Not much spam, not much bullshit on
those channels