Well, with some laptop lacking USB-A ports I can see FlyWeb to be more practical for simple, quick and occasional file transfers. Also, most people have cheap, very-slow USB flash drives, so transfering via the network (even wireless) could be faster for larger files.

Another thing to consider if you compare it with cloud solutions is that you don't have to find a second channel to send the shared link (which may require both person to e.g. login on their webmail, spell their email address to one another, etc).