Nothing helps an author get sales like good reviews, word of mouth, etc.
If the authors want such finite control over who can and cannot read there books, and what people can and cannot say, we must simply ask permission.
If one person does it, they will think that person is sick. If ten people do it, they will believe those ten are insane. However, when enough people do it, and the author is no longer able able to communicate with their publishers, editors and lawyers, because they cannot even access their e-mail, they may begin to realize that their ignorance of the situation is what has crippled them, not the actions of these few people.
Picking a fight with their readers is the easiest way for them to find themselves out of a job. Then they can go back to having someone else tell them what they can and cannot do, and when they can and cannot do it.; which is something that they have worked very hard to not have to do. Then they will see that the freedoms that they wish to restrict for their readers will lead to a restriction in freedoms for themselves.
We will mourn their loss, and as Luddites, they will pass into history only their failures; their dreams forever removed from the common memory.
Others, who can understand and appreciate the subtle differences of today's world, will pick up those readers and gift them with many wonderful new feelings and ideas; visions of a more open world.