Technically yes, but many people use the same password in different places. They may want to steal your accounts by using password that you used in registration process. There is no information about this airdrop on their official site, and twitter profile which is given on airdrop is confirmed fake. I also have taken part in this airdrop, and I was during writing my own steem post about that, but accidentally found an information that this is a scam.

Take a look at this: https://steemit.com/cryptocurrency/@unbiasedwriter/the-monacoin-airdrop-is-a-scam-sorry-guys