If you have a website that can be distributed among arbitrarily many frontend servers, it could make sense to put them on preemptible instances, with the databa

If you have a website that can be distributed among arbitrarily many frontend servers, it could make sense to put them on preemptible instances, with the database on a regular instance. (In the unlikely case no preemptible instances are available, you could always automatically switch the frontend servers to regular ones.) However, I think this could only possibly be efficient pricing-wise if your traffic was extremely bursty.