strictly speaking it's

here’s a gift card so you can give us that money back again we can keep your money but give you something for free later.

Gift cards and store credit = "we keep your money."

The reality is that they didn't give the customer back anything. It's the usual corporate sales speak.

"50% off" and "Save $10" aren't actually real either. $10 doesn't appear in customer's bank accounts after a purchase and customers often have no concept of what the item originally cost before it was marked up and brought to market by the the corporation. It's sales and marketing psychological games that many people can't see through. $9.99/$59.99 is cheaper than $10.00/$60.00 true and people somehow feel better buying the former versus the latter as though that penny isn't only a penny and they didn't give the corporation the 99.99% of the money they wanted.

That's fine. Always need to purchase more storage devices.