Having established Fill-up to be machinery, there is the matter of also being a snake.
And the possibility that his personality is created by the Indian government and aided by old men flutistist who train and study the snakes in India.
Colorful, I admit but assuming the above as premises, the conclusion if modis operandi exists, then: what is the purpose of the Fill-ups. (1) there dedication to the Indian government? and (2) and their biomotivation as snakes? (Eat a meal is one thing, but genetically do they hope to evolve and make humans extinct?)