Black holes exert a tremendous influence on their surroundings, meaning that when they spin, they literally drag the very fabric of space and time around with them. That means nothing can sit still around a rotating black hole, including the "plates" that these cosmic titans feed from.
Those flattened clouds of gas and dust surrounding supermassive black holes are known as accretion disks. Around some supermassive black holes, the churning of these disks is one of the most efficient ways of converting energy in the known universe — changing gravitational and kinetic energy to bright electromagnetic energy, which we know better as just "light."
