These websites are scams, and yes, there is a lot of them. Are they ALL hackers who found a flaw in Bitcoin? Hopefully not! And notice all these websites say the EXACT same thing, but with different domains and addresses.
Second, people have reported bad experiences with them.
Third, why would they even release this to the public? I mean, seriously, 0.9 BTC free in one DAY? Why not just use it for yourself?
Last but not least, (this probably supplies the most evidence) although the payouts displayed on the website differ, the blockchain payouts are ALL THE SAME, which means they probably pay to STOLEN MONEY to one of their partners in crime.
I also truly hope this IS a scam, or else this will crash the Bitcoin economy.
Yes, 100 % scam.