I've never once had difficulty reporting a security vulnerability to Apple. For that matter, I've never seen any of my friends in /r/netsec have difficulty eit

I've never once had difficulty reporting a security vulnerability to Apple. For that matter, I've never seen any of my friends in /r/netsec have difficulty either. Slow to respond? Perhaps, if they receive many reports. Outright ignore or invalidate real flaws? Never seen it. Do you have a data point to back this up?