I'm impressed they managed to get the Big Three of the Deep Learning movement (Geoffrey Hinton, Yann LeCun, and Yoshua Bengio). I remember at the 27th Canadian Conference on Artificial Intelligence 2014, I asked Professor Bengio what he thought of the ethics of machine learning, and he asked if I was a reporter. XD
The Future of Life Institute has published their document Research priorities for robust and beneficial artificial intelligence and written an open letter for people to sign indicating their support.