I know this thread is a little older but I came about it from googling and saw recent replies so I thought I'd ask/state my experiences here. I honestly don't understand the hate for g2a/kinguin (haven't personally used the "cdkeys" site I saw mentioned elsewhere, but they're pretty big too.)
Myself or friends have never had any problems buying cheap games off g2a/kinguin. I think people with bad experiences are buying keys from shady sellers, or buying stuff out of their region. As long as you buy from a good seller in your region or get a global key from a good seller there's slim to none chance of anything going wrong, and in the worst case scenario of the game getting revoked, which again hasn't happened to me or many friends, you'd get a refund/another key from g2a/kinguin anyway with their guarantee.
It's just like ebay, there's shady sellers on there, but I wouldn't condemn the entire site just for some scammers.
For example, the new Mortal Kombat came out,what....2 weeks ago? A week after launch it was already 18 bucks, on kinguin I saw it with the Goro DLC for ~20 bucks from a seller with 100% positive feedback of over 10,000 transactions, somebody wouldn't get that high up if they were scamming people.
And likewise with g2a, HUGE youtubers like Pewdiepie endorse it, almost every time I go on g2a he's in the background with some advertisement. I also heard many others like JackFrags endorse it. Pewdiepie was even the face on the g2a credit card (lol...) when it popped up asking me to sign up before. Also many twitch streamers have g2a referral links.
I honestly don't see the real world difference between somebody saving money on g2a/kinguin, getting it on ebay, getting a game used at gamestop, amazon, from a friend(even borrowing), or a pawn shop,etc. In all of those cases, the game company isn't getting the money anyway. In the real world people have budgets, I haven't personally gotten the new Mortal Kombat, but if I was into fighting games I'd lose no sleep over getting it cheap on kinguin.
I doubt kinguin/g2a would be as big and evil as people claim they are if they were really scamming people. Combined they have over 1 million fb likes, and I'm sure many more use the sites than fb likes would portray, and I doubt HUGE youtubers and streamers would endorse them if they were so evil.
This isn't jumping on anybody at all, I'm just stating mine and my friends experiences getting cheap games. Which I guess some could preach morals about, but again, there's no real world difference between kinguin/g2a vs getting a game used anyway 2nd hand.
I've never gotten a pc game full price, nor will I ever, stuff just drops in price too quickly, and I'm not a big gamer like I used to be, burned out due to many reasons I could write a life story about. I know it would honestly make me depressed though if I had bought the new Mortal Kombat at release for 60+ bucks, and saw a week later it was going for only 18 dollars. I've gone away from getting new AAA releases on PC in recent months due to bad ports and optimization. I now have a gtx 660 in my pc and feel even worse off than when I had my hd 7950 in it. The hd 7950 is barely above minimum specs for Witcher 3 for example, but yet it'll run perfectly fine on the way weaker consoles. I guess that's a little sidetracked, but shows some of the perspective of just one person out of over a million that get cheap games.