They have load balancers, and while they don't have an auto scale feature they do have APIs for starting instances and configuring the load balancer. So it's not that difficult to build your own auto scaling
As compared to a "traditional" offering where there's only a manual order form and getting a new server might take hours, making auto-scaling unfeasible
The most basic thing with a load balancer and scale instances behind that.
They don't have any of that.