I think it might actually work for other digital items outside games - sincerely in games unless they're interoperable between platforms I don't understand what

I think it might actually work for other digital items outside games - sincerely in games unless they're interoperable between platforms I don't understand what would be the advantage - but maybe things like coupons, say you got a coupon from a signup somewhere, and it was represented as something with an expiry date, associated with an email or phone or wtv, but you were never going to use it, maybe selling that and the person associated with it changed to the new owner that then could redeem/use it? Again, not sure it's useful.