For a while I've been seeing tons of comercial adds on youtube about G2A.com and decided to give it a look, apparently is a grey market, which means that their actions are legal, but there are not a direct seller from the big companies, basically they give you a key they bought from steam or ubisoft and re-sell it to you for a cheaper price, the also seem to have an insuranse for 1$ + so you can make a claim if the digital key was used or doesn't work so they give you a refund or another key.

There seems to be a way to get money too if you make people buy games by giving them a link with your account name that goes directly to G2A.

I've seen a small amount of good Youtubers that support G2A, the biggest of them all being Pewdiepie, if you know that guy that apparently has the biggest lets play youtube channel.

But still, is it safe, or scam?