What exactly is your point? Applications bundling their dependencies is the norm on all mass-market desktop and mobile platforms. So commercial developers of packaged software are used to it. Such developers even tend to bundle dependencies when targeting Linux, if they want to be distro-agnostic. In this respect, developers of open-source software are spoiled, because they can delegate dependency handling to the distro or, in many cases, the user.
Have you ever tried writing a Windows installer?