You were right in your first statement, but your follow up is a bad assumption, I think everyone here will agree that in the case of a crash this data should be more easily available and not deleted.
Assuming its not intentionally malicious this is a really dumb bug that I could have also written. You zip up a bunch of data, and then you realize that if you don't delete things you've uploaded you will fill up all available storage, so what do you do? You auto delete anything that successfully makes it to the back-end server, you mark the bug fixed, not realizing that you overlooked crash data as something you might want to keep.
I could 100% see this being what is happening.