Garbage collectors, like clouds, have usage based pricing, and cannot handle everyone spiking at once. They can handle everyone at normal baseline usage, but that's just like saying a cloud provider can handle everyone using the same number of reserved instances they’ve purchased on a long-term basis.
More relevant to the cloud analogy, if all their customers wanted to purchase a large extra pickup (beyond their normal baseline) on their normal day, which is part of garbage service offerings, they wouldn't be able to accommodate it.