Because GoDaddy hasn't invented a viable time machine. In both of your examples, the seller goes back and rights the wrong. In GoDaddy's case, the good they sel

Because GoDaddy hasn't invented a viable time machine. In both of your examples, the seller goes back and rights the wrong. In GoDaddy's case, the good they sell is a continuous service, and the lack of service for some period of time may have had some consequence to their customer. Because GoDaddy can't go back and ensure that whatever consequence doesn't occur, the only way they can try to make up for it is by providing a service credit.