Sorry for your dissatisfaction. At this time this is the way it currently is but you never know, it could change in the future.
I have seen a lot of people now using their own, so, people are changing them. But we did need to set a default upon import of the database and we even ran a content for the members to make them and vote on which one to use. Not that any of that helps. But that is the reason you see the same one right now a lot. Feel free to change yours if you wish. You will find the setting in the MY PROFILE tab.