These robotic waiters were invented with a great purpose. The goal is to provide real jobs to people who are chronically ill or immobile. Workers can serve tables from the comfort of their own homes and beds while making money. Many have suffered from devastating spinal injuries making it impossible to move, so they can control these robots by a computer interface and can feel like a part of society while doing meaningful work.
You can find these at Dawn Cafe in Japan, where your soda or coffee could potentially be brought to you by an exceptional kind of robot controlled by someone with disabilities.