>If Amazon ever gets rid of the without ad version they will lose me as a customer overnight.

Didn't they already remove the option for a completely ad free prime video experience or am I hallucinating that? They have such a ridiculous hold on the e reader market I feel like it is just matter of the next down quarter.

They seem to own 75% of the market, and I think you can get pretty much every book on every device, right? Of course your existing library is locked-in; ideally, that'd be illegal.