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The Google Maps API for Android [1] can only be used on Google-certified devices, as it builds on a Google-provided system library. Therefore, none of the apps embedding Google Maps will work out-of-the-box, unless the device manufacturer violates Google's copyright - which Amazon certainly will not do.

[1] https://developers.google.com/maps/documentation/android/

This isn't related to the question that your parent comment asked. That comment was asking why the Amazon and Apple map products are mobile-only, with no website component. Not sure how a comment about embedding Google maps has anything to do with this.

For Apple at least, they have no motive to gain market share on web-based maps, for them mapping is a means to an end rather than a product line in its own right. Maps on mobile are an expected feature right now, and having their own solution meant more flexibility and control, and less dependence on Google.

It may be a way for them to restrict the initial usage while they build up the service.

Significantly cheaper licensing most likely.