While they do offer you soul gems, there are alot of quests where even though you complete them, they reject you making up some excuse to not pay out soul gems. While you can get up soul gems from all the other tasks among the tasks you can complete from video games, it is really hard to know in advance what games will reward you and what wont. If you take them up on it, they refuse to help you and blame everything on you. I had several games myself where i did the quests several times with different new accounts to make sure i didnt do anything wrong. They rejected the quests each and every time. Regardless of me making a new account according to every step they require and do the missions as stated. Also alot of the surveys just kick you out at the end of the survey without awarding the soul gems, no matter how honest and consistent you are with your answers. I am also not the only one with these problems, there are plenty on the site who are begging for help to understand what they are doing wrong and plenty of others who lose their gems and not get their rewards because of faulty link or expired/used keycodes. So while it might look legit at first glance, the further you get on the platform, the more you start finding out what kind of business they are actually running.
Edit: after a long battle with them i did manage to get my quests accepted (it required me to even contact the quest giving game support) but it seems like the bot or whoever generally reviews those quests is erroneus at best, a jerk at worst... Getting a response from them can take up to several days so if you run into problems be prepared for one hell of a battle. Worse than what you have to endure in the games i might say. After finally getting my gems a month later, i got into another problem with their rewards... fortunately with that i didnt get a response from "misty"... their rather unhelpful and useless bot but someone named blowtorch who seemed a little bit more helpful, and he fixed issues with most of the things i had. Would i get into another month long agony with them for free games? Probably not. Do they reward you? Sometimes they do, sometimes not. All in all i woulnt reccomend it but i will rate it higher since at least one of their supports was able to fix the issues...

Gamehag is just a bs website the tasks always get rejected for everything, from you dident complete the task for some reason, or you have 2 account but you dont, or you dident create your account on their website. And the games are skit too, Its mostly crap games exept Warthunder and some other, But alot of the games are sooo PAY TO WIN, its almost pointless, and then if youv had an account on a game you cant claim your points, i think thats soo anoying and pointless i dont want to redo all my hard work!
If you really want games and other stuff, get a job or something instead this is just bullskit!
Here is some skitty declines of the tasks:
A task for Game of Thrones Winter is Coming has been rejected. It seems like you haven't registered a new account in the game
2:
A task for Crossout has been rejected. Make sure you did everything right, and upload a new screenshot
3:
A task for War Thunder has been rejected. Make sure you did everything right, and upload a new screenshot
4:
A task for Game of Thrones Winter is Coming has been rejected. Having more than one account is not allowed!
5:
A task for Game of Thrones Winter is Coming has been rejected. You haven't completed the task!
6:
A task for War Thunder has been rejected. You haven't completed the task!

AND YES I HAVE DONE THE QUESTS! ARE GAMEHAG STOPID FOR REAL OR WHATTTT!

DONT DO THIS BS