Big loss of stored data, gone to trash, during one night

Customers can’t restore anything from trash. They’d have to upload new data and delete for the “attack” you suggest. Which has no benefit to them and quite a bit of cost and effort for pretty much no effect.

It wasn’t. This was garbage collection which hasn’t run for a while. It’s merely cleaning up (unpaid) data nodes should no longer hold.

That makes sense. My reported “Disk Average Month” is way lower than it should be if all previously held data was paid for.

Yep, that’s how I first noticed it, before the garbage collection even started. See: Discrepancy between B*h reported by satellites and storage used on node (impacting node payouts)