It's not ridiculous at all. Microsoft were using their monopoly in desktop operating systems to gain browser market share. This doesn't benefit anyone apart from Microsoft.
Consider if all manufactured cars came with a really crappy "default" radio with horrible sound. The majority of drivers would choose to upgrade the radio to a better one, thus making the marketplace for car radios a healthier, more competitive one. If the cars came with amazing radios built in, hardly anyone would switch.