I was on some other forums (I won't put which forums as contain illegal things) and I've seen many users posting threads called "Free Giftcards Method" or "How to easily get free giftcards".
I was curious, so I decided to check it out.
So, the scam is this:
1) You go onto g2a.com
2) Select a giftcard that's over $50
3) Buy the giftcard with bitcoin (it has to be bitcoin apparently)
4) Before paying for it, you inject a script that "changes the timezone", which then also changes the deposit address for the payment
5) After paying, there will be a message saying "Sorry, this payment is expired" or something like that
6) They will apparently send the bitcoin back and the giftcard as well
This is quite obviously a scam, but I saw many users falling for it, since they were saying things like "Cool I'll check it out" and "HQ post, will try it"
Be careful with this out there