re-reading the fine print on the 'redeem' page, I see "Clicking ‘Continue’ after selecting the items will immediately render the code used, so make sure to complete your purchase."
So I guess that only ONE user will be able to benefit after all, regardless of the amount of games purchased...
Can confirm that this is what that means. Essentially anyone can use the code to see
the discounts but once one user makes it to the checkout page (the one with the payment options on it) then they either have to pay for what they've selected or the code just automatically expires once they leave that page. If no one moves to the checkout phase, the code remains active until its stated expiry.
(forgot to add) The person who uses the code and who does go to the checkout phase with it will still be able to complete their order if they browse off the checkout page for any reason. They'll just have to go to https://www.gog.com/account/settings/orders
and look for the pending order in the list to complete it since the code becomes unusable. I assume the order will only stay valid/pending for as long as the discount is active or at least a minimal amount of time before GOG's system merely purges it due to incomplete purchase status though.