Amazon were at quite a disadvantage in that regards. They had no unique selling point and no initial phone customer base. Samsung has a customer base to start from and a very large one at that. Not providing Google Maps or YouTube could just be considered as a further monopolisation tactic by Google and would relate exactly to what they’ve just been fined for (preventing forking on Android).
If that was the case Google wouldn’t of just been hit with $5bn fine for the conditions it puts on phone manufacturers for using Android services. Android doesn’t exist separately - it serves the purpose Google has for it.