What is Meta's New AI Supercomputer?

In June last year Tesla unveiled it AI supercomputer. At the time it was the (5th most powerful in the world) to train self-driving AI. It is being used to train the neural nets powering Tesla's Autopilot and upcoming self-driving AI called Dojo supercomputer. Six months later not to be undone Meta has a similar plan. So why are BigTech companies working on supercomputers to train AI? Social media conglomerate Meta is investing around $10 billion a year on the Metaverse, but it needs better AI to power that Metaverse dream as well.