You upgrade your OS or buy a new computer, and you see a new application ( that you didn't install ) and you ( presumably ) can't uninstall it. Wouldn't any rational person assume it's a pre-installed application? Wouldn't it make sense to believe that the OS developer created it?
There's an old joke about IE when people purchase a new computer: It's the browser I use to install another browser. What are people going to think when they don't see IE anymore and they see a new browser?
Everyone will know the Edge is Microsoft's new browser, and everyone knows that Microsoft's previous browser was IE.