BE CAREFUL

It's a scam used to hack Steam accounts.
Few of people on my friendlist seem to log onto it and they already started sending bot messages with links to this site.

Here's a link to Steamgifts discussion about the website.
https://www.steamgifts.com/discussion/TioOP/danger-careful-with-1-free-game-for-new-users-take-the-game-you-want-httpsspindatgamexcom#0wD9FOS