AI/ML is the most exciting fields in CS now. It brings challenges on so many levels: algorithms/software implementation/hardware(client/server/network communication)/resource placement(heterogeneous computation ), and the list goes on. I would go as far as to say it has the potential to ascend as the new purpose of computation itself. Hardly blame someone jumps the ship to goldmine this new wild west, however established that person in his own field may have become.