Actually, it is 100% the point. I never personally agreed with the Microsoft anti-trust scandal (and a lot of people on HN don't): nothing stopped you from installing another browser and making it the default for relevant URI schemes and file types.

Microsoft got nailed because they were popular, not because they forced people to not use Netscape. Now, everyone includes a default browser, and no one sues Apple over forcing all iOS users to use Safari no matter what, even "alternative browsers" must use Safari for their HTML canvas underneath.