I\'ve just noticed that my app\'s storage was bumped almost to it\'s 5GB limits of free usage within the last few weeks. After checking it in more details, it appeared that
Figured out a solution - it appeared there is a way to setup an auto deletion rule in google cloud console for those images that clutter the storage.
go to the google cloud console, select your project -> storage -> browser https://console.cloud.google.com/storage/browser
Select the "artifacts" bucket
Under the "lifecycle" tab add a rule to auto delete old images (in my case I put "delete after 1 day since update" which works fine for me)
Storage is safe now!
Hope the firebase team will improve that - the current behavior looks confusing as it easily leads to an unexpected bill unless you take extra steps to prevent that. But you'll never know that it will happen until it does.