Steam

It is quite interesting that these features (re-)appeared, as a Guest checkout and checkout via Email address, since back in ~2017 this feature was removed in Steam for security reasons to also prevent fraud and manipulation, such as buying/selling between regions with lower prices to higher ones.

Today we’re announcing changes to gifts on Steam. The gifting process has had a bunch of friction in it for a while, and we want to make it easier for you to share the games you love with friends. Steam Gifting will now be a system of direct exchange from gift buyer to gift receiver, and we will be retiring the Gift to E-mail and Gift to Inventory options.

Source [2017-05-04]

For example, in case of infinitely magnificent "CrossCode":

Vietnamese Dong: 6,28€
// ...
Swiss Franc: 21,51€

Source [2026-07-23]

A person residing in marvelous Vietnam could utilize the lower price and sell as an intermediary safely or not. That would definitely damage the monetary support of the actual hard-working artists... permanently malform statistics... and put someone at risk on financial or privacy contexts, too...

Presumably, Steam improved the automated system to detect such manipulations and now, with the system improved, have re-enabled the previously blocked functionality.

Thank you heartfelt... dear Steam Developers, Artists, Maintainers, People... for the ineffably work, effort, miracles...