It doesn't work that way. Any ability to ban "fake news" immediately becomes a vehicle for banning inconvenient news. It's part of human nature. I don't have to list the dozens recent examples of "fake" news turning out to be true. There's a reason that Orwell's censorship body was called the "ministry of truth".
Governments shouldn't touch censorship for the same reason alcoholics shouldn't touch booze.
Governments shouldn't touch censorship for the same reason alcoholics shouldn't touch booze.