Is GK4.me legit?

I dunno. Does it sound legit to you?
Maybe the name reminds you of another equally legit store?

Site that teaches it's customers how to use VPN and family sharing to get around region locks does not really sound legit.

never heard of them :/

Well. I wouldn't buy anything from them. I can't find typicall "About us" tab which is odd. Also the main company name visible on the bottom of the page, GK International LLC, gives different results on google. After quick search I found three companies with that name, none of them sale games (but one of them seems to be selling cars, if you are interested). Also, they way of 'selling' console games is awfull cashgrab trick, that actually don't give you a game that you can activate on your console account.

Yet, still, they seems to have positive reviews on this site, that I have never see before - https://uk.trustpilot.com/review/gk4.me

If you have to ask it probably isnt.

WOT says it's green, that means it SHOULD be trustworthy.

That sounds familar. Did you also get an "item has been delivered" message? I ordered one time last year and the key wouldnt show up in the site profile after they said it was sent. After ~48h I opened a support ticket and it was there rather quickly. Ein "Tobi" hat sich noch tausend Mal für den Fehler entschuldigt ;-) but who screws first time offers cant expect us to have faith in them...

South-East Asian address for a company that doesn't seem to exist anywhere else on the internet? Check.
Gives advices on how to circumvent legal restrictions? Check.
Obviously fake reviews displayed on every page? Check.
45% rating on TrustPilot with 60% of 1-star reviews and all 5-stars with one sentence in broken English/German? Check.

I'd hazard a guess that they are not entirely trustworthy…

Thanks to everyone. I managed to get my money back and will definitely not order from that retailer again. Kinguin is always a good choice, though. I think I bought about 500 games of the 1.9k I own there and never had any issues.