I've heard some codes get generated by the graphics cards software, but do we know for sure if they do a hardware check before spitting out the key?It's more that some software is bundled with a GPU and either Nvidia or the Publisher dictated the launcher do a hardware check before honoring the code to prevent resell.
In Control's case, it seems to be a code anyone can use on EGS, but since people couldn't test it they would mention in the giveaway that they weren't 100% certain it worked like that.