For example, Section 230 and Article III standing work so well because they usually categorically preempt all causes of action asserted by the plaintiff, no matter how many or wide-ranging.
Speculations and hypotheticals are fine, but given that I run a free promo on one of my books about every couple of weeks (I have 15 novels and climbing, so I can have a handful free now and again), I can say categorically that Amazon changed the algorithms.