Anyone else just had SpellForce 2 revoked?

Not yet

i bought mine december 2014, i still have it, good luck trying to find out more info.

Mine's good at the moment, purchased by me in Nov, 2015.

Unmark the "received" box, and contact the giveaway creator ASAP.
Right now, you're shown as having an unactivated win, so you risk suspension.

Looking at what the gifter gifted i think it's probably just some mistake with a payment.

Steam gave me a warning and removed Painkiller Recurring Evil I got from a trade :L
Good thing i saved his information, contacting him now

Got message about Deadfall Adventures (4th sept 2015). I'm sure that I have bought the game myself via some bundle, gotta do some digging and write an email to the bundlesite after I found the guilty one ^^

I got the same message for SpellForce 2 this afternoon, won the game back in early May

There was a mail going around from Luckyrandomkeys stating their opinion on G2A and stolen keys.
It also said that steam would revoke any stolen key they found, so that might be what happened to some of you.
The article they included can be found here.
Basically it means, if you happened to be unlucky enough to have bought or received a stolen key, you're screwed.

I made a giveaway for Spellforce and was revoked, and made for Full Spectrum Warriors: Ten Hammers too and was revoked, and a giveaway that I won for Death Rally was revoked too. Don't know what's happening, but hope that is just a Steam problem.

I actually said to untick "received", not to tick "not received"...
Better use some diplomacy, right?

Is there any way to see the revoked history? I had a window from Steam open but it was empty/badly formatted, now I fear I had something revoked but I don't know how to check! :/

Well, this is an... interesting situation worth following. I never buy games outside of verified stores, but I mean, in general it's something we should be interested in. Also, it reveals the sad truth that we have no idea where the keys we win come from.