Couldn’t fit enough ads in the android UX so they’re starting from scratch. /s

There isn’t a technical reason to do this other than pulling support from Google as they continually show how much Amazon truly sees them as a competitor.

It also shows a roadmap possibility, like Amazon eventually wanting control of their own hardware or chips (which is exactly what they are doing: https://www.aboutamazon.com/news/aws/take-a-look-inside-the-...) to compete with Apple in custom silicon.