Sacred geometry is older than Pythagoras, and common to many esoteric and spiritual practices. Most of these symbols have a specific meaning to the person viewing them and do not constitute a new system. Still others have added in techniques from other things like space aliens, ancient civilizations, Celestine Prophesy, Wicca, Tibetan practices, Ascended Masters, etc. Remember that symbols were a tool to be used to aid you in connecting to the energy, and to guide you but ones, like all conditionings that were to be let go of when no longer needed. For many these days, Reiki has turned into a business.
Businesses thrive by continually coming up with new product.
Usui refused to advertise, nor does it seem that he charged for Reiki. This would seem that the founder did not treat reiki as a business. It would appear that it was a spiritual practice. These days there are some organizations and centers that teach reiki as a vocation. They teach business skills, how to set up a practice and all manner of business accumen.