The history of the keys we win and activate on our steam accounts

I was wondering lately.

When we win gifted keys here on steamgifts we have no way of telling if they work and if they are what they state they are in the giveaway until we copy paste them into steam and try to activate the product, then and only then we find out that the key works and that the product offered in the giveaway is the same one that just got activated.

There is no way however to tell how the key has been acquired. Was it a bunlde key, was it bought from one of the renowned internet retailers or maybe was is bought from a place like G2A and other keyshops. And if it was bought from a keyshop, is it from legal financing sources or from a credit card fraud?

So now I enter a giveaway to which the supplied key is from a credit card fraud and win the game, I activate it because steamgift forces me to do so in 7 days. Steam has it's own ways of fishing out key activations from illegal financing sources and may either remove the game from the account or even block the whole steam account. What can be done in such a case? Can I tell steam it's not me that's being illegal here activating the key it's just that I won it on steamgifts having no idea it's illegal?

Let's assume 99% of the steamgifts community is all legit and simply share what they don't need, have double or just because they like to gift other people for the sake of being nice and kind and charitable. There is still that 1% who may be purchasing keys from illegal sources or even supplying them to the market themselves with stolen credit cards.

Is it actually a problem in the community or am I overexaggerating things?