Get back on the horse.
These things happen. I'm not one who believes that everything is conspiring against you making money online, but if you do enough things, sooner or later, you're going to run into this. It's much like returns; if you sell enough stuff, you're going to get some.
Beyond this, it's been my experience that you'll make a lot more money (and have a lot more ease) if you focus on building a real business than bouncing from one "money maker" to another. I'm all for opportunities to make money and know how exciting something like Kindle, or Squidoo, or Ebay, or Adsense, or Amazon affiliate sites can be, but don't think for a minute that doing the busywork of putting up dozens, or hundreds, or even thousands of articles, PLR books, reviews, blogs, or similar things is something that will last for years. It can be, as we've seen this week, disappear within minutes, so if you're going to do something of this nature, keep that in mind.
I encourage anybody who has ever done something like this and had it all destroyed to share your experience below...
Personally, I've had several of these things happen over the years, but one that I remember the specifics for, which I think is similar to what happened this week with Kindle, was when I had a side hustle with over 800 sites getting Adwords clicks. One day everything was working, the next day, because of a change at Google, it wasn't...and I was still paying to host 800 sites, register 800 domains, hundreds of blogs helping to drive traffic, links I had purchased to help SEO, etc. Not the best day I've ever had, but you move on...hopefully.