Imagine if you purchased a PC from Dell, and you got your e-mail is an account at your Internet Service Provider, let's say Comcast (just cause it's a name that most know, certainly not because it's the best).
Later, you decide you don't want to use a Dell computer anymore, and you buy a Mac. But, even though you've set your brand new Mac up to connect to your Internet Service Provider, you are unable to receive your email. You didn't change your e-mail address, you're still using the same Internet Service Provider (unfortunately Comcast). And, yet you cannot get your e-mails to be received on your shiny new expensive Mac.
People are sending their messages to you the same as they always have, you've properly set up your new machine on the same ISP, and yet nothing arrives in your inbox.
You then call Apple for support, and yet they can't help you. You call Comcast, and they can't help you. You call Dell, and find out that your e-mail address is forever tied to that Dell computer. You will not receive e-mail messages from other people who use Dell computers. And, they provide you no way to get your email messages ever again from any other Dell computer user, unless you either buy another Dell computer or go back to using your old Dell computer. Now, for entertainment purposes, we are going to pretend that Dell holds 60 to 70 percent of the computer market.
If you had purchased your last machine from anyone other than Dell, you'd still be getting your email messages.
Who do you think you're going to blame that issue on?
Let's assume Dell ignores your requests to fix this problem for you... now what?
Sure, you could get a new e-mail address. But, that's not always practical, some people have a lot of things tied up with their current phone numbers and e-mail addresses. In some cases, changing your contact information could cost you a lot of business (because who can really go and update everyone who's received a published phone book immediately).
All of this because you naively assumed that you could buy a new computer and connect it to your same ISP and everything would be OK (as everyone would have expected).
I bet if we adapted the current story to fit the names and situation above, all the Apple defenders would be screaming to burn Dell to the ground.
This is the very same scenario. And, the very actions that are illegal and penalized under monopoly laws. And, it doesn't have to be deliberately created to function this way. If the end result is this effect, it will be penalized. Particularly when a company is not responsive to immediately resolving the issue upon first becoming aware of it.