I really don't mind :-)
My first assumption is that people around here try to help. Better safe than sorry.

Ignore SG's biggest and most infamous still-active troll, above. The rule in question is against harassment or questioning the legitimacy of a giveaway, and community mindset has always been pretty in line with the rules.

In fact, "Best just to trust they know what they’re giving away." runs directly against community common sense; A substantial amount of both GA creators and entrants appreciate polite information contributions.

That is to say, anyone being helpful is appreciated, anyone being a dick isn't, and generally people do try to assume someone is attempting the first when in doubt. Generally better to be a bit more carefully (solicitiously) polite in your phrasing though than you were, admittedly.

Confirming the source of a key is not part of that rule- in fact, there's another rule that explicitly encourages you doing such- so long as you're polite about it, and don't imply that the giveaway is fake. Ie, it's okay to note a possibility for confusion, but not okay to imply anything outright.

Thus, "Hey, just want to make sure this isn't a key from [X], since those are from GOG. Sorry if this is a key from somewhere else, wasn't sure!" is ideal, while "Keys from GOG aren't allowed" isn't allowed, and "Fake" or "You should delete this" are explicitly prohibited and guaranteed suspensions.

To remain respectful to giveaway creators, do not write comments that question the legitimacy of their giveaways. For example, it would be inappropriate to comment that a giveaway is "fake" when you notice a new user has created a giveaway for a highly desirable game.

If you notice a user not following our guidelines, do your best to politely explain our rules with relevant links or quotes to our guidelines when appropriate.