It's a bit like the company that builds the road not only charging you a toll for using it but permitting only their own brand of car to use it. If it's just one backroad then it's a minor problem but if the company happens to build half the roads in the country then it does become a major problem.
And then, to compound the problem, they insist on charging you for using third party fuel.
That's not a great analogy. Consumers currently have choice. They don't need to use Apple at all, and can still have access to the full internet and a full library of apps.
A better analogy is if Apple sold a car that could only be fueled up at Apple's own gas stations. As a user, er driver, you are guaranteed to get premium fuel and great service every time, but Apple is profiting off of every fill.
Choose to go to another gas station and Apple can't promise that you'll get the same level of service, and can't protect you from nefarious stations or attendants.
So the real question is — what is your privacy worth?