Actually Apple does with imessage. What was and sometimes still is the biggest feature that is used on a mobile phone? text messaging. Apple knows this and thus it want's everyone in the world to use an Apple iphone and the way to do this is to prevent the biggest feature of a mobile phone from working with your competitor (Android) by preventing direct interoperability between their text messaging systems. There are many of us who have family members that are in both camps, iphone users and android users. Both camps should be able to flawlessly text each other without the need for phone settings to change or to install 3rd party apps. An android using family member should be able to just add their iphone using family members contact details into their android phone, press on their contact name in the address book and start texting one another but Apple prevents that from happening because it will not allow Android to use it's imessage system. This gap is bridged by 3rd party app developers but it shouldn't be. If my sister buys an Apple iphone and I have an android phone (Motorola), when she rings me to tell me she has got a new iphone I should be able to just add her new telephone number into my contacts list, save her details, then start texting one another but I can't. If I want to be able to have flawless text messaging between my sister and me without the use of 3rd party apps or either of us having to spend time going into each of our phones settings to change some settings, I cannot do that, I have to by an iphone. THIS is what Apple wants and THIS is why it is anticompetitive.