are these airdrops safe?
whether safe or not, two thing are certain,
One
I didn't send any money
Two
they can not hack my wallet with just my public address and bct username and profile link

Perfectly true, a along as they force no wallet we only give away an email
And to think that it's all free so we can try them all.

There's nothing to lose, right?
You guys should try to join any how as this is fun like no investment, just fill out the form and you're ready to go.
Here's an airdrop, try to join.
https://bitcointalk.org/index.php?topic=2243403.0You're welcome!