Some users also buy a Kindle which is subsidized by ads? I pay to avoid this and change privacy settings.. If you are using a device designed to market to you

Some users also buy a Kindle which is subsidized by ads? I pay to avoid this and change privacy settings.. If you are using a device designed to market to you - they almost all run ads and collect analytics. I guess this is technically not a user facing feature, but it provides some user benefit (cheaper price). Does anyone know sales breakdowns? If everyone is concerned about privacy / not being marketed too I guess the versions with ads are not selling. But I've been surprised not that marketing platforms collect data (authors website did) but that most users don't care about this "abuse" that the author is so concerned about.