Pulling 1000+ Kindle Worlds books from Kindle Unlimited is a mistake that I think you will come to regret very quickly.
Considering the no doubt hundreds of people who are on KU specifically for the KW books that will now be flocking to you only to cancel their KU subscriptions, I believe it will be a lesson learned via your pocketbook. But we all know that’s where it will make the most impact as you have proven time and again that making a profit is the most important thing to you. It’s a shame that once again, you are choosing money over your customers.
But for future reference, if you would simply poll your customers (and your loyal authors!) before making this type of rash decision, maybe you could avoid alienating anymore of your dwindling fan base.