[robbiemitchell]

We had the same cold start problem and couldn’t find a way to reliably keep things warm. For instance, Lambda would often spawn a new instance rather than re-use the warm one.

In the end, we came to the conclusion that Amazon is smart and won’t let you hack together the equivalent of a cheaper EC2.

[jacques_chester]

I don't think it's deliberately so, just that developing a solution requires scheduling and routing to cooperate. Normally they're considered by separate systems. As your execution pool expands, this problem becomes worse, not better.

On the other hand, their incentive to solve the problem is relatively weak vs an on-premise alternative.