Its not really an easter egg as far as I can tell. From what I understand it's used to find the curser easily, similar to wjndows' control-to-find. It is a bit comical to how big it gets thigh
That’s a very Linuxy thing to do. The devs allow you to do whatever you want. If you want to have several 4K displays and find your cursor by shaking it, go right ahead. If you want to cover the entire display with a massive cursor, be my guest.