This is not reliability. This is a measure of how much spare capacity AWS seems to be leaving idle for you to snatch on-demand. This is going to vary a lot ba

This is not reliability. This is a measure of how much spare capacity AWS seems to be leaving idle for you to snatch on-demand. This is going to vary a lot based on the time of year. Why don't you try this same experiment at around some time when there's a lot of retail sales activity (Black Friday), and watch AWS suddenly have much less capacity to dole out on-demand. To me reliability is a measure of what a cloud does compared to what it says it will do. GCP is not promissing you on-demand instances instantaneously is it? If you want that ... reserve capacity.