The only trustworthy key sites I know of are: Green Man & Fanatical, most game keys distributed on either site are gathered from the developers directly and region free meaning they work regardless of where you live (although not every game, depends on the publisher) while from Steam proper, sales may appear (some are worldwide while others are regional).
Green Man and fanatical are trustworthy because they purchase and sell keys as a proper retailer by buying keys from the devs.
Sites like g2a sell spare keys or dubious key sources, such as using stolen credit cards. Using a reputable seller like gmg is completely fine, g2a and the likes on the other hand often actively hurts the devs.
slazer2au@lemmy.world 2 days ago
On steam or through Humble Bundles.
But it has been a while since I got a bundle.
Pika@sh.itjust.works 2 days ago
Honestly, aside from humble choice, I don’t really use the platform much anymore. It’s been quite some time since I’ve seen a half-decent game bundle through them which is unfortunate.
I still find their humble choice program is well worth the money put in it is a shame that their bundles just fall through now.