Apple's culture of silence works well enough that employees are self-censoring. You do hear a few stories now and then, but often constrained to IS&T or from non-engineering orgs:

https://news.ycombinator.com/item?id=22804607

https://news.ycombinator.com/item?id=12502336

https://news.ycombinator.com/item?id=9342994