I'm just wondering if it is safe those who are giving free coins asking for private keys, and saying that it is safe they don't store it? The usual sample is asking you your ETH balance, then a certain coins balance, and it will generate how much coins you will get based on your ETH and a specified coin balances. Then they will ask for your Private keys. I just passed by all this coz I don't want to compromise my wallet for few tokens.
By the very word 'private' we should understand that it must never be shared. The other address is the public key and that can be shared to anyone anywhere. Anyone asking you to share your private key to your wallet is fooling you and is actually a scammer. Don't ever trust anyone with this strategy promising that it won't be kept. I have been a victim of phishing and I know what I am talking about. There are now so many hackers, phishers, scammers around because they know that what they are doing can be so lucrative once they can get victims into their traps. Be careful in dealing with anyone anytime.