To be frank it's not Amazon's problem.
Its the content publishers problem.
And Amazon isn't enabling this, they're just making an Android device.
The users are putting software onto the device.
This article sets a dangerous precedent. That if Amazon doesn't lock the firestick down like Apple that they're enabling piracy.
Its not Googles nor Microsoft's responsibilities either. They helped, probably solely for money, but they're not obligated to continue to update their DRM.
This article should have framed how DRM repeatedly hasn't worked.