Amazon has been a huge staging ground for the proliferation of AI-generated spam. In fact, as we noticed earlier this year, its marketplace has already started to fill up with shoddy AI-generated listings — at the same time, of course, that Amazon itself is working on tech to generate more of the same.Now the consequences of this proliferation seem to be spilling over into the world of Amazon's millions of readers. Many of its Kindles, by far the most popular e-readers in the world, are displayi...