Heya, as @bglw mentioned in the other thread, even though your sprite might still show running, it has begun the suspend process and is no longer being billed. So if the concern here is about being billed for sprites that should be inactive, it’s not actually a problem (although definitely understand the concern)!
When a sprite is inactive, you’re only paying for cold storage (we just updated storage pricing to distinguish between “cold” and “hot”). Cold storage is very cheap ($0.02/GB-month), and destroying a sprite but continuing to store a checkpoint wouldn’t really be any cheaper, because the checkpoint is also stored in cold storage and we’d probably price checkpoint storage identically.