Does anyone knows a official statement of Valve for Steam Gifts?

When you login you go via the Steam OpenID system -- on the Steam site. Isn't that official enough?

Too lazy to find it.. Just tell him to register, he will not get banned..

As Gabe Newell, I'm watching you. All of you.

if he is not intending to do some fucked up things in here he will be fine.

290,324 Members can confirm this!

Go in the Steam Forums, then in Trade and look in the third-party website section, SteamGifts is there, maybe it will convince him?

Yes, all the users in this site have been hacked a day after their registration.

We are all banned, do not let him register!

You will NOT be banned for joining steamgifts. If your friend is truly that worried about his account then I'd recommend him not to try Steam Trading VIA SteamTrades.com or anywhere else for that matter.

You risk your Steam account everytime you trade with / accept games from a stranger. Games may come from a hijacked account, keys may be revoked, chargeback issues may occur, etc. Valve officially says: "You should not accept Steam Gifts from anyone you do not know."

SteamGifts uses Valve's Steam OpenID system, which means that Valve approved SteamGifts' use of this system.

There's not much I can say. I've used this site since a year. I received and delivered numerous games. Considering I have around 950 games in my account, you could say that I'm taking a big risk, but I haven't seen anything wrong so far.

Your call. If your account is too precious to risk, don't do trades and don't accept anything from people you don't know.