Come on, he's the new messiah, so it's to be expected that cults will arise and people will try to make a living catering for the devout. Humanity has always been fascinated by its more powerful members, and people have always tried to idolize them in an attempt to bask in their reflected glory.
This is clearly the case here, as this is a simple publicity stunt, and they needed somebody who would "create the buzz". An approximate statue (probably made by some Public.com manager's "artistically inclined" family member) of a nobody wouldn't create the brand awareness they wanted. Pin his Muskiness' name on it though, and now everybody has heard of "Public.com". Mission accomplished.