That is a fair point, I don't think the OP's complaint about the 20-to-0 switch was invalid, but I do skip past it to try and look at what kind of benefit can be squeezed from their current predicament instead of scorching the earth and walking away.
The OP clearly decided that not doing business with Amazon was the right choice for their business, and Amazon richly deserves the scorching.
Amazon looked like it was setting up an app store where Android developers had a hope of getting paid, but so far, they've created a space where the control-freakism runs deeper than under Apple (e.g., the lack of control over basics like device filtering and removing apps from sale), and the return on investment is worse than under Google.
Thank you for the feedback.