You are running a software built by said commercial 3rd-party company. They don't need that server in the middle to see all of those things.
So there's no increase in capability if they are malicious. There is an increase in risk if they are incompetent - and do something like cache requests/responses containing that data.
now you have steve watching every single thing you do on his computer, you will pay 130$ for service packs, and good luck getting parts or repair on that mac (which has a very high chance of failure within the first year)
Try using Apple HW instead of just bashing it. There are a lot of MB/MBP out there running MS crap because they are so reliable, and actually run software without machinations. Rating a new version of an OS as a service pack is ludicrous. Maybe you ought to actually use a permissions based OS before you run your keys the next time
The number of computer scientists in a room is inversely proportional to the number of bugs in their code.