Open your finder. Every file that you see has just been touched by apples code.
Your OS does have access to all files that you have on your computer. It manages all network connections. It exposes all information that tools such as little snitch display to you. Apple signs and provides all software updates to you. They control SPI and app sandboxing. I'm not saying that Apple does access your files. I do trust them not to since they've shown that they at least attempt to step up and defend themselves and their users. Still, they could if they wanted to.
lil snitch is one of the best tools out there, and it's what inspired me to never use apple software again... so I did the right thing and gave my lil snitch registration code to a friend.
I'm still looking for a linux alternative to lil snitch that is just as robust and intuitive - but I'm stuck using a few different things to achieve the same effect. Anyone have a recommendation with a slick GUI (for some reason I really like a GUI for firewall management)