Imagine a giant software company which is supplying the world's leading OS software and all PC manufacturers want to offer their customers the option of buying PCs with the OS pre-installed. Along comes the software company and says "We'll let you have our software almost for free provided you agree to NEVER sell any one elses OS", "Furthermore, if you do sell anyone else's OS, we will not supply you with our OS which means you will have hardly any sales and you w