Shorter: Don't put all your eggs in one basket.
Which is why this piece in the New York Times is making me scratch my head. Let me be clear: I understand that as an indie author I have a lot more freedom than most traditionally published authors. If I want to change prices, all I have to do is go to my author dashboards on KDP or Smashwords. Also, if I really wanted to, I could sell my books directly on my website, in addition to or instead of selling them through other vendors. Authors who are published through publishing houses generally can't make those decisions on their own.
This is not a static industry, and everyone has to constantly adapt. It stinks when we'd rather be doing things like writing, but that's the way it is. If, indeed, Amazon is doing corrupt things (it's one thing to lose your spot on a list due to an algorithm, it's another to lose it because someone took you off of it) then that highlights that we need to be less vulnerable to them. Yes, by all means, report this to whichever regulating bodies are appropriate, but in the meantime work every other angle and advantage you have.