Yea this is true I dont think Dentacoin came up with this Telegram Airdrop because this evening when I was going through my Telegram message I figured the bot asked for my private key. And I also know no genuine campaign project will demand for my private key. I will be doomed if i did send my private key.
We should be careful especially newbies who dont know their left from their right.
When in doubt leave it and ask questions, continue after verification.
If you dont get a clear response don't proceed. In this system your little mistake clears your hard earned money in a jiffy.
Your 'watchword' should be 'caution'.